Bumped CI to Java 11

.github/workflows/maven.yml

@@ -1,18 +1,17 @@
 name: Java CI
 
-on: [push]
+on: [ push ]
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v1
-      - name: Set up JDK 1.8
+      - name: Set up JDK 11
         uses: actions/setup-java@v1
         with:
-          java-version: 1.8
+          java-version: 11
       - name: Build with Maven
         run: mvn -B package --file pom.xml
       - run: mkdir -p target