chore: add changelog to cloud-rad (#539)

This PR was generated using Autosynth. 🌈 Synth log will be available here: https://source.cloud.google.com/results/invocations/b5390bb6-f3f8-479c-b587-987d27920504/targets - [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.) Source-Link: googleapis/synthtool@c86c7a6

Author: yoshi-automation

.kokoro/release/publish_javadoc11.sh

@@ -42,6 +42,8 @@ mvn clean site -B -q -P docFX
 
 # copy README to docfx-yml dir and rename index.md
 cp README.md target/docfx-yml/index.md
+# copy CHANGELOG to docfx-yml dir and rename history.md
+cp CHANGELOG.md target/docfx-yml/history.md
 
 pushd target/docfx-yml
 

synth.metadata

@@ -4,7 +4,7 @@
  "git": {
  "name": ".",
  "remote": "https://github.com/googleapis/java-translate.git",
- "sha": "2af5141b699fa147ec5872ddc2ce1dc92a1996a7"
+ "sha": "d07cd0ab5890905f2b3ee4aa881ad15190057817"
  }
  },
  {
@@ -27,7 +27,7 @@
  "git": {
  "name": "synthtool",
  "remote": "https://github.com/googleapis/synthtool.git",
- "sha": "4f4b1b9b8d8b52f1e9e4a76165896debce5ab7f1"
+ "sha": "c86c7a60985644eab557949363a38301d40d78d2"
  }
  }
  ],