test on Java 16 & 17

Author: oschwald

.github/workflows/test.yml

@@ -7,7 +7,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        version: [ 8, 9, 10, 11, 12, 13, 14, 15 ]
+        version: [ 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 ]
     steps:
       - uses: actions/checkout@v2
         with: