Extend allowed line-length to 120

.travis.yml

@@ -8,4 +8,4 @@ install:
   - pip install pycodestyle
 # command to run tests
 script:
-  - find . -iname "*.py" -print0 | xargs -0 pycodestyle
+  - find . -iname "*.py" -print0 | xargs -0 pycodestyle --max-line-length 120