Script needs to be a string

Author: fabianvf

.travis.yml

@@ -13,7 +13,8 @@ jobs:
   include:
   - stage: verify-tag
     python: 3.7
-    script: [ "v$(python -c 'import kubernetes ; print(kubernetes.__version__)')" == "${TRAVIS_TAG}" ]
+    script: |
+      [ "v$(python -c 'import kubernetes ; print(kubernetes.__version__)')" == "${TRAVIS_TAG}" ]
   - stage: test
     python: 2.7
     env: TOXENV=update-pycodestyle