chore(deps): update dependency semantic-release to v15.13.3 (#107)

chore(deps): update dependency semantic-release to v15.13.3

Merge pull request #78 from jfairley/renovate/semantic-release-15.x

chore(deps): update dependency semantic-release to v15.6.0

fix(reviews): improve messages for commented and dismissed context

fix: show attachment color for review message

fix: show review state in DM

feat: DM for pull request review

fix: ignore closed issues

fix: show repo/user on status message

chore: remove unused @types/superagent

fix: remove status summary lookup

without a complex deduping effort, every status webhook results in a message, so there's lots of duplicated data. if there's going to be a DM per webhook, it might as well report a single thing.