Updated graphql-core requirement

Author: syrusakbary

.travis.yml

@@ -8,7 +8,7 @@ python:
 - pypy
 install:
 - pip install pytest pytest-cov coveralls flake8
-- pip install graphql-core==0.1a0
+- pip install graphql-core==0.5.0
 - python setup.py develop
 script:
 - py.test --cov=graphql_relay

setup.py

@@ -54,7 +54,7 @@ def run_tests(self):
     packages=find_packages(exclude=['tests']),
 
     install_requires=[
-        'graphql-core>=0.4.7a0'
+        'graphql-core>=0.5.0'
     ],
     tests_require=['pytest>=2.7.2'],
     extras_require={