fix(package): npm audit

fix: quotation marks in setup description (probot#1175)

fix(github): Octokit is optional

fix(github): provide default ProbotOctokit (probot#1169)

feat: const { GitHubAPI } = require('probot') (probot#1165)

Co-authored-by: Gregor Martynus <[email protected]>

chore(package): update lockfile package-lock.json

fix: Revert "feat: mention that app must be activated after install (p…

…robot#1155)"

This reverts commit 05c9240.

The `[ ] active` checkbox is now set automatically

feat: mention that app must be activated after install (probot#1155)

Recent change in the GitHub app installation workflow now 
requires that an app must be activated after installation. That
should be mentioned in the "success" page.

Co-authored-by: Gregor Martynus <[email protected]>

fix: remove unused dependencies (probot#1151)

fix(package): update is-base64 to version 1.1.0 (probot#1148)