fix(deps): add packaging requirement (#82)

Add packaging requirement. packaging.version is used for a version comparison in transports/base.py and is needed after the upgrade to gapic-generator-python 0.46.3

Author: busunkim96

setup.py

@@ -31,6 +31,7 @@
 dependencies = [
  "google-api-core[grpc] >= 1.22.2, < 2.0.0dev",
  "proto-plus >= 1.10.0",
+ "packaging >= 14.3",
 ]
 extras = {}
 

testing/constraints-3.6.txt

@@ -6,4 +6,5 @@
 # e.g., if setup.py has "foo >= 1.14.0, < 2.0.0dev",
 # Then this file should have foo==1.14.0
 google-api-core==1.22.2
-proto-plus==1.10.0
+proto-plus==1.10.0
+packaging==14.3