added language

.travis.yml

@@ -35,6 +35,9 @@ addons:
 jobs:
   include:
     - stage: jobs
+      language: bash
       script: bash tests/tests_jc2server.sh
-    - # stage name not required, will continue to use `test`
+    - # stage name not required
       script: bash tests/tests_ts3server.sh
+    - # stage name not required
+      script: bash tests/tests_shellcheck.sh