Fixed #106

Author: thomaswoehlke

.github/workflows/maven.yml

@@ -16,9 +16,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
+    - name: Set up JDK 13s
+      uses: actions/setup-java@v13
       with:
-        java-version: 1.8
+        java-version: 13
     - name: Build with Maven
       run: ./mvnw -B package --file pom.xml