update CI

.gitlab-ci.yml

@@ -6,11 +6,9 @@ stages:
   - test
 
 build:
-  image: openjdk:8
+  image: openjdk:11
   stage: build
   script:
-    # see discussion in the answer of https://stackoverflow.com/questions/44911155/gradle-how-to-include-runtimeonly-dependencies-in-javaexec-classpath
-    - ./gradlew --console=plain --no-daemon relast.preprocessor:jar
     - ./gradlew --console=plain --no-daemon assemble jar
   artifacts:
     paths:
@@ -18,7 +16,7 @@ build:
 
 
 test:
-  image: openjdk:8
+  image: openjdk:11
   stage: test
   script:
     - ./gradlew --console=plain --no-daemon check