chore(master): release 0.59.1 (googleapis#1128)

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

Author: release-please[bot]

CHANGELOG.md

@@ -1,6 +1,13 @@
 # Changelog
 
 
+### [0.59.1](https://github.com/googleapis/gapic-generator-python/compare/v0.59.0...v0.59.1) (2022-01-10)
+
+
+### Bug Fixes
+
+* refactor mtls logic to standalone method ([#1123](https://github.com/googleapis/gapic-generator-python/issues/1123)) ([d528223](https://github.com/googleapis/gapic-generator-python/commit/d528223e3221487f86a3d82c92cd2e2cf04bec4a))
+
 ## [0.59.0](https://www.github.com/googleapis/gapic-generator-python/compare/v0.58.4...v0.59.0) (2022-01-10)