fix(deps): update dependency gcp-metadata to v3

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
gcp-metadata	dependencies	major	^2.0.0 -> ^3.0.0

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Release Notes

googleapis/gcp-metadata

v3.0.0

Compare Source

⚠ BREAKING CHANGES

• isAvailable now tries both DNS and IP, choosing whichever responds first (#​239)

Features

• isAvailable now tries both DNS and IP, choosing whichever responds first (#​239) (25bc116)

2.0.4 (2019-09-13)

Bug Fixes

• IP address takes 15 seconds to timeout, vs., metadata returning immediately (#​235) (d04207b)
• use 3s timeout rather than 15 default (#​237) (231ca5c)

2.0.3 (2019-09-12)

Bug Fixes

• use IP for metadata server (#​233) (20a15cb)

2.0.2 (2019-08-26)

Bug Fixes

• allow calls with no request, add JSON proto (#​224) (dc758b1)

2.0.1 (2019-06-26)

Bug Fixes

• docs: make anchors work in jsdoc (#​212) (9174b43)

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[codecov]

Codecov Report

Merging #1115 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1115      +/-   ##
==========================================
- Coverage   94.96%   94.93%   -0.04%     
==========================================
  Files          98       98              
  Lines        6392     6392              
  Branches      500      500              
==========================================
- Hits         6070     6068       -2     
  Misses        166      166              
- Partials      156      158       +2

Impacted Files	Coverage Δ
src/trace-writer.ts	90.83% <0%> (-1.67%)	⬇️

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