fix: removed trailing whitespace on travis file

Author: cryptaliagy

.travis.yml

@@ -5,6 +5,6 @@ python:
 # command to install dependencies
 install: "pip install -r requirements.txt . && pip install flake8"
 # command to run tests
-script: 
+script:
   - pytest
   - flake8 . --count --select=W291,W293,W391 --statistics