Test compatibility with TypeScript 4.5

Author: novemberborn

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ts-version: [~4.4]
+        ts-version: [~4.4, ~4.5]
     steps:
       - uses: actions/checkout@v2
       - run: rm .npmrc