fix: commentReply is not a function

[jakebolam]

This showed up in sentry: https://sentry.io/all-contributors/github-bot/issues/845638720/events/42773873695/

[codecov]

Codecov Report

Merging #38 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master      #38   +/-   ##
=======================================
  Coverage   57.95%   57.95%           
=======================================
  Files           4        4           
  Lines          88       88           
  Branches       10       10           
=======================================
  Hits           51       51           
  Misses         32       32           
  Partials        5        5

Impacted Files	Coverage Δ
src/processIssueComment.js	92% <0%> (ø)	⬆️

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[all-contributors-release-bot]

🎉 This PR is included in version 1.0.0 🎉

The release is available on GitHub release

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