Firestore: Pin black version (via synth).

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/firestore/synth.py. synthtool > Ensuring dependencies. synthtool > Pulling artman image. latest: Pulling from googleapis/artman Digest: sha256:8900f94a81adaab0238965aa8a7b3648791f4f3a95ee65adc6a56cfcc3753101 Status: Image is up to date for googleapis/artman:latest synthtool > Cloning googleapis. synthtool > Running generator for google/firestore/artman_firestore.yaml. synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1. synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1beta1/write.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1/google/cloud/firestore_v1beta1/proto/write.proto synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1beta1/common.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1/google/cloud/firestore_v1beta1/proto/common.proto synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1beta1/firestore.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1/google/cloud/firestore_v1beta1/proto/firestore.proto synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1beta1/document.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1/google/cloud/firestore_v1beta1/proto/document.proto synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1beta1/query.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1/google/cloud/firestore_v1beta1/proto/query.proto synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1beta1/google/cloud/firestore_v1beta1/proto. synthtool > Replaced 'from google.cloud import firestore_v1beta1' in tests/unit/gapic/v1beta1/test_firestore_client_v1beta1.py. synthtool > Replaced 'client = firestore_v1beta1.FirestoreClient' in tests/unit/gapic/v1beta1/test_firestore_client_v1beta1.py. synthtool > Running generator for google/firestore/artman_firestore_v1.yaml. synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1. synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1/write.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1/google/cloud/firestore_v1/proto/write.proto synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1/common.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1/google/cloud/firestore_v1/proto/common.proto synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1/firestore.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1/google/cloud/firestore_v1/proto/firestore.proto synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1/document.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1/google/cloud/firestore_v1/proto/document.proto synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/firestore/v1/query.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1/google/cloud/firestore_v1/proto/query.proto synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/firestore-v1/google/cloud/firestore_v1/proto. synthtool > Replaced 'from google.cloud import firestore_v1' in tests/unit/gapic/v1/test_firestore_client_v1.py. synthtool > Replaced 'client = firestore_v1.FirestoreClient' in tests/unit/gapic/v1/test_firestore_client_v1.py. .coveragerc .flake8 MANIFEST.in noxfile.py.j2 setup.cfg synthtool > Replaced 'GOOGLE_APPLICATION_CREDENTIALS' in noxfile.py. Running session blacken Creating virtualenv using python3.6 in .nox/blacken pip install black==19.3b0 black docs google tests noxfile.py setup.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/gapic/enums.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/gapic/firestore_client_config.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/gapic/transports/firestore_grpc_transport.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/common_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/document_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/common_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/gapic/firestore_client.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/firestore_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/query_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/document_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/query_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/write_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/write_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/gapic/enums.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/gapic/transports/firestore_grpc_transport.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/gapic/firestore_client_config.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/common_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/gapic/firestore_client.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/document_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/common_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/firestore_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1/proto/firestore_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/query_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/document_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/query_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/write_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/write_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/noxfile.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/tests/unit/gapic/v1/test_firestore_client_v1.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/tests/unit/gapic/v1beta1/test_firestore_client_v1beta1.py reformatted /tmpfs/src/git/autosynth/working_repo/firestore/google/cloud/firestore_v1beta1/proto/firestore_pb2.py All done! ✨ 🍰 ✨ 31 files reformatted, 76 files left unchanged. Session blacken was successful. synthtool > Cleaned up 2 temporary directories. synthtool > Wrote metadata to synth.metadata. 

[tseaver]

Failing Firestore systest: reopened #6605.