types: addition of EncryptedType

Addition of `EncryptedType` in sqlalchemy-utils types.
We never use backslashes, change this to:

```python
def __repr__(self):
    return (
        "User(id={}, username={}, access_token={},"
        "active={}, accounts={})".format(
            self.id, 
            self.username, 
            self.access_token, 
            self.is_active,
            self.accounts_num
        )
    )
```