chore: release 0.39.1

[release-please]

🤖 I have created a release *beep* *boop*

0.39.1 (2021-01-05)

Bug Fixes

• fix missing .coveragerc and the broken bazel build (#723) (7f8235f)
• Update gapic-generator-python to gracefully handle internal google inconsistencies (#721) (b984295)
• updating testing, rest-only generation, & minor bug-fixes (#716) (56c31de)

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This PR was generated with Release Please.

[codecov]

Codecov Report

Merging #724 (29595fd) into master (b984295) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #724   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           27        27           
  Lines         1619      1619           
  Branches       328       328           
=========================================
  Hits          1619      1619           

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[yoshi-automation]

Release is at https://github.com/googleapis/gapic-generator-python/releases/tag/v0.39.1