Fixing pylint-plugin-utils dependency URL

Author: carlio

.travis.yml

@@ -4,6 +4,6 @@ python:
   - "2.7"
 install:
   - "pip install --use-mirrors -r test_requirements.txt"
-  - "pip install --use-mirrors https://github.com/landscapeio/pylint-plugin-utils"
+  - "pip install --use-mirrors git+https://github.com/landscapeio/pylint-plugin-utils.git"
   - "pip install --use-mirrors --editable ."
 script: python test/test_func.py