Test major Java versions with GitHub actions as documented on

https://github.com/actions/setup-java

Author: garydgregory

.github/workflows/maven.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ 8, 11, 12, 13 ]
+        java: [ 8, 11, 12, 13, 14 ]
 
     steps:
     - uses: actions/checkout@v1