Only install twisted on python 2.

Author: habnabit

.travis.install

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+PYTHON_VERSION=$(python --version 2>&1)
+
+if [[ "$PYTHON_VERSION" > "Python 3" ]]; then
+
+else
+    pip install twisted
+fi

.travis.yml

@@ -11,8 +11,8 @@ matrix:
     - python: 2.6
 
 install:
-  # `pip install twisted` fails on python 3 except on trunk.
-  - "pip install pytest coveralls pytz . git+https://github.com/twisted/twisted"
+  - "bash .travis.install"
+  - "pip install pytest coveralls pytz ."
 script:
   - "coverage run $(which py.test) ."
 after_success: