chore(deps): update dependency com.google.api:gax-bom to v1.51.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.api:gax-bom (source)	minor	1.50.1 -> 1.51.0

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Release Notes

googleapis/gax-java

v1.51.0

Compare Source

12-03-2019 10:59 PST

New Features

• Allow channel pool to refresh its channels periodically (#​805)

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[codecov]

Codecov Report

Merging #85 into master will increase coverage by 0.1%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master      #85     +/-   ##
===========================================
+ Coverage     66.32%   66.43%   +0.1%     
  Complexity      367      367             
===========================================
  Files            34       34             
  Lines          1865     1865             
  Branches        236      236             
===========================================
+ Hits           1237     1239      +2     
+ Misses          526      524      -2     
  Partials        102      102

Impacted Files	Coverage Δ	Complexity Δ
...src/main/java/com/google/cloud/ServiceOptions.java	41.73% <0%> (+0.82%)	30% <0%> (ø)	⬇️

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