fix data type inconsist error

[laiqun]

convert bytes to String

[mishbahr]

Why is this necessary?

EmailActivationTokenGenerator is roughly based on django PasswordResetTokenGenerator

See https://github.com/django/django/blob/master/django/contrib/auth/tokens.py

They don't seem to force token to be a string.

[laiqun]

If don't have it,will raise reverse error in my environment.

[mishbahr]

Please can you post the full traceback?

[laiqun]

sorry ,this fix have problem
the correct is 'uid':str(...)