chore: clean up

Author: parthea

packages/proto-plus/.repo-metadata.json

@@ -2,6 +2,7 @@
     "name": "proto-plus",
     "name_pretty": "Proto Plus",
     "client_documentation": "https://googleapis.dev/python/proto-plus/latest",
+    "issue_tracker": "https://github.com/googleapis/google-cloud-python/issues",
     "release_level": "stable",
     "language": "python",
     "library_type": "CORE",