Update dependency google-proto-files to ^0.20.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
google-proto-files	devDependencies	minor	^0.19.0 -> ^0.20.0	source

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Release Notes

googleapis/nodejs-proto-files

v0.20.0

Compare Source

03-15-2019 11:15 PDT

This release includes updated proto files from
googleapis/googleapis.

Internal / Testing Changes

• build: use per-repo npm publish token (#​162)

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[codecov-io]

Codecov Report

Merging #428 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #428   +/-   ##
=======================================
  Coverage   94.88%   94.88%           
=======================================
  Files         140      140           
  Lines        9294     9294           
  Branches      671      671           
=======================================
  Hits         8819     8819           
  Misses        475      475

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