Fixed travis.yml linting error

.travis.yml

@@ -39,8 +39,8 @@ env:
   global:
     - PYTHONUNBUFFERED=True
 before_install:
-  - openssl aes-256-cbc -K $encrypted_b3fcf6d0737c_key -iv $encrypted_b3fcf6d0737c_iv
-      -in credentials.tar.gz.enc -out credentials.tar.gz -d
+    - openssl aes-256-cbc -K $encrypted_b3fcf6d0737c_key -iv $encrypted_b3fcf6d0737c_iv
+            -in credentials.tar.gz.enc -out credentials.tar.gz -d
     - |
       case "$TRAVIS_EVENT_TYPE" in
         push|pull_request)