Update dependency semver to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
semver	dependencies	major	^5.5.0 -> ^6.0.0	source

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Release Notes

npm/node-semver

v6.0.0

Compare Source

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[googlebot]

So there's good news and bad news.

👍 The good news is that everyone that needs to sign a CLA (the pull request submitter and all commit authors) have done so. Everything is all good there.

😕 The bad news is that it appears that one or more commits were authored or co-authored by someone other than the pull request submitter. We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that here in the pull request.

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[codecov-io]

Codecov Report

Merging #449 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #449      +/-   ##
==========================================
- Coverage   94.96%   94.95%   -0.01%     
==========================================
  Files         148      148              
  Lines        9944     9940       -4     
  Branches      705      704       -1     
==========================================
- Hits         9443     9439       -4     
  Misses        501      501

Impacted Files	Coverage Δ
src/detect-resource.ts	90.9% <0%> (-1.95%)	⬇️
test/test-detect-resource.ts	99.02% <0%> (-0.49%)	⬇️
src/stackdriver-monitoring.ts	83.33% <0%> (+1.04%)	⬆️

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[googlebot]

A Googler has manually verified that the CLAs look good.

(Googler, please make sure the reason for overriding the CLA status is clearly documented in these comments.)

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[googlebot]

So there's good news and bad news.

👍 The good news is that everyone that needs to sign a CLA (the pull request submitter and all commit authors) have done so. Everything is all good there.

😕 The bad news is that it appears that one or more commits were authored or co-authored by someone other than the pull request submitter. We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that here in the pull request.

Note to project maintainer: This is a terminal state, meaning the cla/google commit status will not change from this state. It's up to you to confirm consent of all the commit author(s), set the cla label to yes (if enabled on your project), and then merge this pull request when appropriate.

ℹ️ Googlers: Go here for more info.

[googlebot]

A Googler has manually verified that the CLAs look good.

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