chore: release 2.8.0

[release-please[bot]]

:robot: I have created a release *beep* *boop*

2.8.0 (2020-11-13)

Features

• switch PHP GAPICs to use default scopes (#3306) (f6ec598)

Bug Fixes

• update protobuf to 3.13.0 (#3307) (65490f3)

This PR was generated with Release Please.

[codecov[bot]]

Codecov Report

Merging #3309 (30a2469) into master (f6ec598) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #3309   +/-   ##
=========================================
  Coverage     87.13%   87.13%           
  Complexity     6115     6115           
=========================================
  Files           495      495           
  Lines         24159    24159           
  Branches       2634     2634           
=========================================
  Hits          21051    21051           
  Misses         2242     2242           
  Partials        866      866           

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