Update dbcommands.py (#144)

Just fixed confusion about command doc (List roles. => List privileges.)

Author: AdrienPensart

pgspecial/dbcommands.py

@@ -139,7 +139,7 @@ def list_roles(cur, pattern, verbose):
         return [(None, cur, headers, cur.statusmessage)]
 
 
-@special_command("\\dp", "\\dp [pattern]", "List roles.", aliases=("\\z",))
+@special_command("\\dp", "\\dp [pattern]", "List privileges.", aliases=("\\z",))
 def list_privileges(cur, pattern, verbose):
     """Returns (title, rows, headers, status)"""
     sql = SQL(