fix(deps): update dependency gcp-metadata to ^0.9.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
gcp-metadata	dependencies	minor	^0.8.0 -> ^0.9.0	source

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Release Notes

googleapis/gcp-metadata

v0.9.0

Compare Source

10-26-2018 13:10 PDT

• feat: allow custom headers (#​109)
• chore: update issue templates (#​108)
• chore: remove old issue template (#​106)
• build: run tests on node11 (#​105)
• chores(build): do not collect sponge.xml from windows builds (#​104)
• chores(build): run codecov on continuous builds (#​102)
• chore(deps): update dependency nock to v10 (#​103)
• chore: update new issue template (#​101)
• build: fix codecov uploading on Kokoro (#​97)
• Update kokoro config (#​95)
• Update CI config (#​93)
• Update kokoro config (#​91)
• Re-generate library using /synth.py (#​90)
• test: remove appveyor config (#​89)
• Update kokoro config (#​88)
• Enable prefer-const in the eslint config (#​87)
• Enable no-var in eslint (#​86)

New Features

A new option, headers, has been added to allow metadata queries to be sent with custom headers.

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@@            Coverage Diff            @@
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  Files             ?        9           
  Lines             ?      601           
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  Hits              ?      552           
  Misses            ?       35           
  Partials          ?       14

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