fixup! test: cover supported node versions with travis

Author: rvagg

.travis.yml

@@ -36,7 +36,7 @@ install:
 before_script:
   - flake8 --version
   # stop the build if there are Python syntax errors or undefined names
-  - flake8 . --count --select=E9,F63,F72,F82 --show-source --statistics
+  - flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
   # exit-zero treats all errors as warnings.  Two space indentation is OK.  The GitHub editor is 127 chars wide
   - flake8 . --count --exit-zero --ignore=E111,E114,W503 --max-complexity=10 --max-line-length=127 --statistics
   - npm install