Release gax-java v1.41.0

[andreamlin]

This pull request was generated using releasetool.

02-28-2019 13:09 PST

Implementation Changes

• Add builder methods to EmptyMessage (#685)

New Features

• Add an EmptyMessage class, analogous to protobuf's Empty (#678)
• Add 200 as a valid HTTP status code (#679)
• Expose LRO callables for HttpJson (#684)

Documentation

• Auto-update the gax version in README.md (#675)
• 1.40.0 for all build tools (#677)

[codecov]

Codecov Report

Merging #686 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #686   +/-   ##
=========================================
  Coverage     75.32%   75.32%           
  Complexity     1030     1030           
=========================================
  Files           195      195           
  Lines          4628     4628           
  Branches        357      357           
=========================================
  Hits           3486     3486           
  Misses          984      984           
  Partials        158      158

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[andreamlin]

PTAL

[andreamlin]

Actually I want to get in https://github.com/googleapis/gax-java/pull/683/files first.