Use TRAVIS_PYTHON_VERSION to install aiohttp on Python 3.

.travis.yml

@@ -8,7 +8,7 @@ python:
 install:
   - "pip install -r requirements_dev.txt"
   - "python setup.py install"
-  - python check_py3k.py && pip install aiohttp || true
+  - if [[ $TRAVIS_PYTHON_VERSION == 3* ]]; then pip install aiohttp; fi
 script: py.test -x tests/
 branches:
   only:

check_py3k.py

@@ -1,6 +0,0 @@
-import sys
-
-if sys.version_info[0] < 3:
-    sys.exit(1)
-else:
-    sys.exit(0)