Added Java 16 and 17 to Github Action tests

diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index a8fa3ce..28267d8 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -25,7 +25,7 @@
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
-        java: [7, 8, 11, 15]
+        java: [7, 8, 11, 15, 16-ea, 17-ea]
       fail-fast: false
 
     runs-on: ${{ matrix.os }}