Fix GitHub action for Java 15-ea.
diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index dd0fbb5..4797e4c 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -27,7 +27,7 @@
         java: [ 8, 11, 14 ]

         experimental: [false]

         include:

-          - node: 15-ea

+          - java: 15-ea

             experimental: true        

         

     steps: