Updated requirements and travis config (removed pypy until is stable)

Author: syrusakbary

.travis.yml

@@ -2,10 +2,7 @@ language: python
 sudo: false
 python:
 - 2.7
-# - 3.4
-# - 3.5
-# - 3.6
-- "pypy-5.3.1"
+# - "pypy-5.3.1"
 before_install:
 - |
   if [ "$TRAVIS_PYTHON_VERSION" = "pypy" ]; then

setup.py

@@ -23,8 +23,8 @@
 
 install_requires = [
     'six>=1.10.0',
-    'promise>=2.1.dev',
-    'Rx>=1.5.9',
+    'promise>=2.1',
+    'rx>=1.6.0',
 ]
 
 tests_requires = [