chore: release 0.31.0 (#558)

* chore: updated CHANGELOG.md [ci skip]

* chore: updated setup.py

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

Author: release-please[bot]

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [0.31.0](https://www.github.com/googleapis/gapic-generator-python/compare/v0.30.0...v0.31.0) (2020-07-28)
+
+
+### Features
+
+* bypass request copying in method calls ([#557](https://www.github.com/googleapis/gapic-generator-python/issues/557)) ([3a23143](https://www.github.com/googleapis/gapic-generator-python/commit/3a2314318de229a3353c984a8cb2766ae95cc968))
+
+
+### Bug Fixes
+
+* add google.api_core.retry import to base.py ([#555](https://www.github.com/googleapis/gapic-generator-python/issues/555)) ([1d08e60](https://www.github.com/googleapis/gapic-generator-python/commit/1d08e60cea4c5b3fa2555a4952161b0115d686f2))
+
 ## [0.30.0](https://www.github.com/googleapis/gapic-generator-python/compare/v0.29.2...v0.30.0) (2020-07-27)
 
 

setup.py

@@ -20,7 +20,7 @@
 
 PACKAGE_ROOT = os.path.abspath(os.path.dirname(__file__))
 
-version = "0.30.0"
+version = "0.31.0"
 
 with io.open(os.path.join(PACKAGE_ROOT, "README.rst")) as file_obj:
     README = file_obj.read()