Update dependency gcp-metadata to v1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
gcp-metadata	dependencies	major	^0.9.3 -> ^1.0.0	source

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Release Notes

googleapis/gcp-metadata

v1.0.0

Compare Source

02-14-2019 16:00 PST

Bug Fixes

• fix: ask gaxios for text and not json (#​152)

Documentation

• docs: update links in contrib guide (#​168)
• docs: add lint/fix example to contributing guide (#​160)

Internal / Testing Changes

• build: use linkinator for docs test (#​166)
• chore(deps): update dependency @​types/tmp to v0.0.34 (#​167)
• build: create docs test npm scripts (#​165)
• test: run system tests on GCB (#​157)
• build: test using @​grpc/grpc-js in CI (#​164)
• chore: move CONTRIBUTING.md to root (#​162)
• chore(deps): update dependency gcx to v0.1.1 (#​159)
• chore(deps): update dependency gcx to v0.1.0 (#​158)
• chore(deps): update dependency gcx to v0.0.4 (#​155)
• chore(deps): update dependency googleapis to v37 (#​156)
• build: ignore googleapis.com in doc link check (#​153)
• build: check broken links in generated docs (#​149)
• chore(build): inject yoshi automation key (#​148)

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Codecov Report

Merging #346 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #346      +/-   ##
==========================================
+ Coverage   94.88%   94.91%   +0.02%     
==========================================
  Files         140      140              
  Lines        9293     9294       +1     
  Branches      671      671              
==========================================
+ Hits         8818     8821       +3     
+ Misses        475      473       -2

Impacted Files	Coverage Δ
test/nocks.ts	62.71% <0%> (+0.64%)	⬆️
src/stackdriver-monitoring.ts	82.29% <0%> (+2.08%)	⬆️

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[mayurkale22]

Fixed the build, tests got impacted because of googleapis/gcp-metadata#117

@draffensperger @justindsmith can you please review and approve.