much simpler

.travis.yml

@@ -6,6 +6,6 @@ python: 3.5
 install:
   - pip install tox
 script: tox -e $TOX_ENV
-after_success: 
+after_success:
   - pip install coveralls
-  - python {toxinidir}/run_coveralls.py
+  - if [[ "${TOX_ENV}" == "py35" ]]; then coveralls; fi

run_coveralls.py

@@ -1,11 +0,0 @@
-#!/bin/env/python
-import os
-from subprocess import call
-
-
-if __name__ == '__main__':
-    travis = 'TRAVIS' in os.environ
-    py35 = os.environ.get('TOX_ENV') == 'py35'
-
-    if travis and py35:
-        raise SystemExit(call('coveralls'))