use java 11

Author: codezninja

.github/workflows/build.yml

@@ -16,10 +16,10 @@ jobs:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
 
-      - name: Set up JDK 9
+      - name: Set up JDK 11
         uses: actions/setup-java@v2
         with:
-          java-version: '9.0.0+181'
+          java-version: '11'
           distribution: 'adopt'
 
       - name: Validate Gradle wrapper