Modern dependencies: remove beta qualifier, get greenlet that is known to build on windows.

.travis.yml

@@ -19,7 +19,7 @@ install:
     # disables the cache.
     # We need wheel>=0.26 on Python 3.5. See previous revisions.
     - travis_retry pip install -U wheel
-    - travis_retry pip install -U tox cython greenlet pep8 pyflakes "coverage>=4.0b3" "coveralls>=1.0b1"
+    - travis_retry pip install -U tox cython greenlet pep8 pyflakes "coverage>=4.0" "coveralls>=1.0"
 script:
     - if [[ $TRAVIS_PYTHON_VERSION == '2.7' && $LINT == true ]]; then python setup.py develop && make travis_test_linters; elif [[ $LINT == false && $TRAVIS_PYTHON_VERSION == 'pypy' ]]; then python setup.py develop && make fulltoxtest; elif [[ $LINT == false ]]; then python setup.py develop && make fulltoxtest; fi
 notifications:

appveyor.yml

@@ -65,7 +65,7 @@ install:
   # compiled extensions and are not provided as pre-built wheel packages,
   # pip will build them from source using the MSVC compiler matching the
   # target Python version and architecture
-  - "%CMD_IN_ENV% pip install cython greenlet"
+  - "%CMD_IN_ENV% pip install -U cython greenlet"
 
   - "python util/cythonpp.py -o gevent.corecext.c gevent/core.ppyx"
   - "type gevent\\callbacks.c >> gevent.corecext.c"

setup.py

@@ -316,7 +316,7 @@ def read(name, *args):
 if PYPY:
     install_requires = []
 else:
-    install_requires = ['greenlet >= 0.4.7']
+    install_requires = ['greenlet >= 0.4.9']
 
 # If we are running info / help commands, or we're being imported by
 # tools like pyroma, we don't need to build anything

tox.ini

@@ -5,8 +5,8 @@ envlist =
 [testenv]
 deps =
     greenlet
-    cython
-    coverage >= 4.0b3
+    cython >= 0.23.4
+    coverage >= 4.0
 whitelist_externals =
     *
 commands =