fix(deps): update dependency google-gax to ^0.26.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
google-gax	dependencies	minor	^0.25.0 -> ^0.26.0	source

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Release Notes

googleapis/gax-nodejs

v0.26.0

Compare Source

04-30-2019 20:45 PDT

Implementation Changes

• refactor: a huge refactor of call handling (#​467)
• feat: do not use legacy grpc loadObject (#​477)

New Features

• feat: turned google-proto-files into a dev dependency (#​470)

Dependencies

• chore(deps): unpin grpc (#​475)
• fix: pin grpc 1.20.0 (#​474)
• chore(deps): update dependency nyc to v14 (#​468)
• fix(deps): update dependency @​grpc/proto-loader to ^0.5.0 (#​466)
• chore(deps): update dependency mocha to ~6.1.0 (#​464)
• chore(deps): update dependency typescript to ~3.4.0
• chore(deps): update dependency @​types/semver to v6

Internal / Testing Changes

• test: end-to-end system test (#​471)
• update to .nycrc with --all enabled (#​476)
• test: better return type for typescript 3.4.0 (#​463)

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[codecov]

Codecov Report

Merging #606 into master will increase coverage by 3.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #606      +/-   ##
==========================================
+ Coverage   57.91%   61.09%   +3.18%     
==========================================
  Files          21       21              
  Lines        3027     3375     +348     
  Branches      167      453     +286     
==========================================
+ Hits         1753     2062     +309     
  Misses       1252     1252              
- Partials       22       61      +39

Impacted Files	Coverage Δ
dev/src/timestamp.ts	92.3% <0%> (-7.7%)	⬇️
dev/src/validate.ts	89.55% <0%> (-4.45%)	⬇️
dev/src/serializer.ts	93.6% <0%> (-2.92%)	⬇️
dev/src/convert.ts	89.87% <0%> (-2.86%)	⬇️
dev/src/document.ts	94.28% <0%> (-2.69%)	⬇️
dev/src/transaction.ts	95.83% <0%> (-2.48%)	⬇️
dev/src/write-batch.ts	98.19% <0%> (-1.81%)	⬇️
dev/src/watch.ts	96.51% <0%> (-1.71%)	⬇️
dev/src/index.ts	94.86% <0%> (-1.25%)	⬇️
dev/src/reference.ts	99% <0%> (-0.13%)	⬇️
... and 5 more

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