fix(deps): update dependency google-proto-files to ^0.18.0

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This PR contains the following updates:

Package	Type	Update	Change	References
google-proto-files	dependencies	minor	^0.17.0 -> ^0.18.0	source

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Release Notes

googleapis/nodejs-proto-files

v0.18.0

Compare Source

11-09-2018 15:34 PST

This is a minor service release, with a few internal changes.

• refactor: use walkdir instead of globby (#​109)
• chore: drop contributors from multiple places (#​108)
• chore: use latest npm on Windows (#​107)
• refactor: convert to typescript (#​106)
• refactor: use a src/ directory (#​105)
• chore: update CircleCI config (#​104)
• chore: include build in eslintignore (#​101)
• chore(deps): update dependency eslint-plugin-node to v8 (#​97)
• chore: update issue templates (#​96)
• chore: remove old issue template (#​94)
• build: run tests on node11 (#​93)
• chores(build): do not collect sponge.xml from windows builds (#​92)
• chores(build): run codecov on continuous builds (#​91)
• chore: update new issue template (#​90)
• build: fix codecov uploading on Kokoro (#​86)
• build: automate library with synth.py (#​85)
• chore(deps): update dependency sinon to v7 (#​84)

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