Added package develop

Author: syrusakbary

.travis.yml

@@ -5,6 +5,7 @@ python:
 install:
 - pip install pytest pytest-cov coveralls flake8
 - pip install git+https://github.com/dittos/graphql-py.git # Last version of graphql-py
+- python setup.py develop
 script:
 - py.test --cov=graphql_relay
 # - flake8