Add fail-fast

Author: jcs090218

.github/workflows/test.yml

@@ -17,6 +17,7 @@ jobs:
     continue-on-error: ${{ matrix.experimental }}
     timeout-minutes: 3
     strategy:
+      fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         emacs-version: