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 #459 into master will decrease coverage by 1.95%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #459      +/-   ##
==========================================
- Coverage   95.71%   93.76%   -1.96%     
==========================================
  Files          10       10              
  Lines         397      449      +52     
  Branches       37       74      +37     
==========================================
+ Hits          380      421      +41     
- Partials       17       28      +11

Impacted Files	Coverage Δ
src/entry.ts	93.1% <0%> (-6.9%)	⬇️
src/index.ts	95.43% <0%> (-4.04%)	⬇️
src/sink.ts	100% <0%> (ø)	⬆️
src/middleware/express/make-middleware.ts	100% <0%> (ø)	⬆️
src/metadata.ts	100% <0%> (ø)	⬆️
src/middleware/context.ts	100% <0%> (ø)	⬆️
src/log.ts	83.33% <0%> (+1.72%)	⬆️

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