Update CI settings.

Author: try0

.github/workflows/maven.yml

@@ -9,10 +9,10 @@ jobs:
 
     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

.travis.yml

@@ -1,7 +1,7 @@
 language: java
 
 jdk:
-  - openjdk8
+  - openjdk11
 
 addons:
   sonarcloud: