Rename to use source (and fix typo)

README.md

@@ -99,8 +99,8 @@ accepts a `message` argument.
 Attributes:
 
 - **body**: the body of the message
-- **sender**: the sender of the message
-- **receive**: the receive of the message
+- **source**: where the message came from (can be a user or a room)
+- **receiver**: the receiver of the message
 - **nickname**: the nickname of the sender
 - **type**: the type of message (`chat` or `groupchat`)
 

xbotlib.py

@@ -21,7 +21,7 @@ class SimpleMessage:
         return self.message["body"]
 
     @property
-    def sender(self):
+    def source(self):
         return self.message["from"].bare
 
     @property