feat: Support Probot v13 (#128)

BREAKING CHANGE: drop support for no longer maintained Node.js versions (14 and 16). Node 18+ is required now

Author: Oatelaus

.github/workflows/test.yml

@@ -12,9 +12,8 @@ jobs:
     strategy:
       matrix:
         node_version:
-          - 14
-          - 16
           - 18
+          - 20
     steps:
       - uses: actions/checkout@v3
       - name: Use Node.js ${{ matrix.node_version }}