Use warning for shellcheck

.github/workflows/reviewdog.yml

@@ -14,3 +14,4 @@ jobs:
         with:
           github_token: ${{ secrets.github_token }}
           reporter: github-check
+          level: warning

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: ./
+      - uses: .
         id: autobump
         with:
           file: testdata/testfile