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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