Don't require Redis 2.10.

requirements.txt

@@ -1,2 +1,2 @@
-redis==2.10.0
+redis>=2.7
 click>=3.0.0

setup.py

@@ -17,7 +17,7 @@ def get_version():
 
 
 def get_dependencies():
-    deps = ['redis >= 2.10.0', 'click >= 3.0']
+    deps = ['redis >= 2.7.0', 'click >= 3.0']
     if sys.version_info < (2, 7) or \
             (sys.version_info >= (3, 0) and sys.version_info < (3, 1)):
         deps += ['importlib']