Fix desc of offline kwarg

#16

Author: Katistic

vrcpy/client.py

@@ -47,7 +47,7 @@ def fetch_full_friends(self, offline=True, n=0, offset=0):
         !! This function uses possibly lot of calls, use with caution
 
             offline, boolean
-            Include offline friends or not
+            Get offline friends instead of online friends
 
             n, integer
             Number of friends to return (0 for all)