Merge pull request #88 from jupyter-server/link-check

Update check-release.yml

Author: Steven Silvester

.github/workflows/check-release.yml

@@ -38,7 +38,7 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ~/.cache/pytest-link-check
-          key: ${{ runner.os }}-linkcheck-${{ hashFiles('**/.md') }}-md-links
+          key: ${{ runner.os }}-linkcheck-${{ hashFiles('**/*.md') }}-md-links
           restore-keys: |
             ${{ runner.os }}-linkcheck-
       - name: Print env