Update .travis.yml

Author: prateekiiest

.travis.yml

@@ -12,12 +12,13 @@ python:
   - "3.2"
 
 # command to install dependencies
-python setup.py install  
+
 
 install:
- 
-  - pip install -r requirements.txt
-  - pip3 install -r requirements.txt
+    
+    - git clone git://github.com/astropy/ci-helpers.git
+    - source ci-helpers/travis/setup_conda.sh
+
 # command to run tests