fix(travis): renamed stages

.travis.yml

@@ -3,13 +3,13 @@ services:
 
 jobs:
   include:
-    - stage: build
+    - stage: "build"
       name: go-build
       script: make container-go-build
-    - stage: test
+    - stage: "test"
       name: go-test
       script: make container-go-test
-    - stage: pre-deploy
+    - stage: "pre-deploy"
       name: rpm-build
       script: make container-rpm-build