readme fix; unecessary capitalize

Author: Guillaume Badi

README.md

@@ -43,5 +43,5 @@ result = mailjet.sender.post(data={'email': '[email protected]'})
 ## Combine an resource with an action
 ``` python
 # Get the contact lists of contact #2
-result = mailjet.Contact_getcontactslists(id=2)
+result = mailjet.contact_getcontactslists.get(id=2)
 ```

mailjet/client.py

@@ -61,7 +61,7 @@ def __init__(self, auth=None, config=Config()):
 
     def __getattr__(self, name):
         split = name.split('_')
-        name = split[0].capitalize()
+        name = split[0]
         action = None
         if (len(split) > 1):
             action = split[1]