Handle version-specific dependencies w/ PEP 508

Author: stefankoegl

.travis.yml

@@ -12,6 +12,7 @@ python:
 - pypy3
 install:
 - travis_retry pip install -r requirements.txt
+- travis_retry pip install -r requirements-dev.txt
 - travis_retry pip install coveralls
 - if [ "$TRAVIS_PYTHON_VERSION" != "3.3" ]; then travis_retry pip install hypothesis; fi
 script:
@@ -23,8 +24,6 @@ addons:
   apt:
     packages:
     - pandoc
-before_deploy:
-- pip install -r requirements-dev.txt
 deploy:
   provider: pypi
   user: skoegl

requirements-dev.txt

@@ -1,3 +1,3 @@
 wheel
 pypandoc
-hypothesis >= 3
+hypothesis>=3; python_version=="2.7" or python_version>"3.3"