Release gax-java v1.42.0

[andreamlin]

This pull request was generated using releasetool.

03-04-2019 16:21 PST

Implementation Changes

• Add 200 as a valid HTTP status code (#679)
• Add builder methods to EmptyMessage (#685)

New Features

• Add an EmptyMessage class, analogous to protobuf's Empty (#678)
• Expose LRO callables for HttpJson (#684)
• [LRO] Add ApiMessageOperationTransformer (#683)

Documentation

• 1.40.0 for all build tools (#677)

[codecov]

Codecov Report

Merging #689 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #689   +/-   ##
=========================================
  Coverage     75.53%   75.53%           
  Complexity     1035     1035           
=========================================
  Files           196      196           
  Lines          4656     4656           
  Branches        358      358           
=========================================
  Hits           3517     3517           
  Misses          981      981           
  Partials        158      158

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