Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -21,7 +21,7 @@ test-assignment:
   stage: test
   dependencies:
     - build-jdk8
-  script: "java -cp "chocopy-ref.jar:target/assignment.jar" chocopy.ChocoPy --pass=.s --dir src/test/data/pa2/sample --test"
+  script: "java -cp chocopy-ref.jar:target/assignment.jar chocopy.ChocoPy --pass=.s --dir src/test/data/pa2/sample --test"
 
 test-positive-whole:
   stage: test