Updated pypromise version requirement

Author: syrusakbary

.travis.yml

@@ -8,7 +8,7 @@ python:
 - pypy
 cache: pip
 install:
-- pip install --cache-dir $HOME/.cache/pip pytest-cov pytest-mock coveralls flake8 isort==3.9.6 gevent==1.1b5 six>=1.10.0 pypromise>=0.3.0
+- pip install --cache-dir $HOME/.cache/pip pytest-cov pytest-mock coveralls flake8 isort==3.9.6 gevent==1.1b5 six>=1.10.0 pypromise>=0.4.0
 - pip install --cache-dir $HOME/.cache/pip pytest>=2.7.3 --upgrade
 - pip install -e .
 script:

setup.py

@@ -27,7 +27,7 @@
 
     keywords='api graphql protocol rest',
     packages=find_packages(exclude=['tests', 'tests_py35']),
-    install_requires=['six>=1.10.0','pypromise>=0.3.0'],
+    install_requires=['six>=1.10.0','pypromise>=0.4.0'],
     tests_require=['pytest>=2.7.3', 'gevent==1.1rc1', 'six>=1.10.0', 'pytest-mock'],
     extras_require={
         'gevent': [