v2.0.0 breaking changes jwt.encode()

Expected Result

jwt.encode() to return an object with a decode property.

Actual Result

E       AttributeError: 'str' object has no attribute 'decode'**

Reproduction Steps

import jwt
from datetime import datetime

secret, algorithm = 'secret', 'hs256'
now = int(datetime.now().timestamp())
payload = {'sub': 'Expiry Test', 'iat': now, 'exp': now + 2}

token = jwt.encode(payload, secret, algorithm=algorithm.upper()).decode()

System Information

$ python -m jwt.help

{
  "cryptography": {
    "version": "2.8"
  },
  "implementation": {
    "name": "CPython",
    "version": "3.8.6"
  },
  "platform": {
    "release": "19.6.0",
    "system": "Darwin"
  },
  "pyjwt": {
    "version": "2.0.0"
  }
}
        

[arberx]

For backwards compatibility, decode() should be a method on the class, and simply call .decode_complete().

In its current form in v2.0.0, this is a significant change to this interface and will break a lot of projects.

[jpadilla]

Unrelated to https://github.com/jpadilla/pyjwt/commit/94d102b2e38d09f3c5ec459a8365de8a86c51fe5

jwt.encode(...) now returns a string instead of a byte string.

https://github.com/jpadilla/pyjwt/blob/master/CHANGELOG.md#jwtencode-return-type