Allow usernames with numbers

X Æ A-12
real context: group usernames with numbers

Author: ja5087

ocflib/account/validators.py

@@ -344,9 +344,6 @@ def validate_username(username, check_exists=False):
     if not 3 <= len(username) <= 16:
         raise ValueError('Username must be between 3 and 16 characters.')
 
-    if not all(c.islower() for c in username):
-        raise ValueError('Username must be all lowercase letters.')
-
     if check_exists and not user_exists(username):
         raise ValueError('Username does not exist.')