⬆️ Java 11

Author: yhs0602

.github/workflows/ci.yml

@@ -7,6 +7,6 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-java@v1
         with:
-          java-version: 1.8
+          java-version: 11
       - uses: gradle/wrapper-validation-action@v1
       - run: ./gradlew build