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.