chore: update dependencies

[targos]

Most semver-major bumps are for dropping Node.js 6 support.

[codecov]

Codecov Report

Merging #371 into master will not change coverage.
The diff coverage is 80.76%.

@@           Coverage Diff           @@
##           master     #371   +/-   ##
=======================================
  Coverage   75.23%   75.23%           
=======================================
  Files          21       21           
  Lines        1409     1409           
=======================================
  Hits         1060     1060           
  Misses        349      349

Impacted Files	Coverage Δ
lib/config.js	80.95% <ø> (ø)	⬆️
lib/auth.js	80.43% <0%> (ø)	⬆️
lib/team_info.js	92.15% <100%> (ø)	⬆️
lib/reviews.js	98.41% <100%> (ø)	⬆️
lib/pr_checker.js	96.33% <100%> (ø)	⬆️
lib/cache.js	100% <100%> (ø)	⬆️
lib/ci/ci_type_parser.js	80.95% <100%> (ø)	⬆️
lib/metadata_gen.js	100% <100%> (ø)	⬆️
lib/ci/ci_result_parser.js	46.06% <42.85%> (ø)	⬆️

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[targos]

/cc @joyeecheung @priyank-p

[priyank-p]

LGTM!