Run lint and vendor-check on the same travis stage (#802)

.travis.yml

@@ -11,10 +11,10 @@ install:
 - make dep-install
 jobs:
   include:
-  - stage: Lint
-    script: make lint
-  - stage: Vendor Check
-    script: make vendor-check
+  - stage: Lint & Vendor Check
+    script:
+      - make lint
+      - make vendor-check
   - stage: Test unit and integration
     script: make test-unit-coverage
   - stage: Test e2e on private network