(doc) run CI also with Java 16/17-ea

Author: slachiewicz

.github/workflows/maven.yml

@@ -25,7 +25,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest,windows-latest, macOS-latest]
-        java: [8, 11, 14, 15]
+        java: [8, 11, 16, 17-ea]
       fail-fast: false
 
     runs-on: ${{ matrix.os }}