[dependencies] Update docker client library version

"docker-py" is now just "docker"

beat/core/dock.py

@@ -457,7 +457,7 @@ class Host(object):
     def statistics(self, container):
         '''Returns the statistics about a container'''
 
-        client = docker.Client()
+        client = docker.APIClient()
 
         data = client.stats(container.id, decode=True, stream=False)
 

setup.py

@@ -43,7 +43,7 @@ requires = [
     "sphinx-rtd-theme",
     "matplotlib>=1.4",
     "pyzmq",
-    "docker-py",
+    "docker",
 ]
 
 # The only thing we do in this file is to call the setup() function with all