Fix decoding string token

[AlyaGomaa]

the server throws unauthorized error every time a valid user tries to access it, it's trying to decode the token (treating it as bytes instead of str) which is not the case here

[erwin-eiq]

This was fixed by merging #184 (which also fixed the missing and mandatory algorithms arg in jwt.decode, hence I merged that one instead).

Thanks for the contribution @AlyaGomaa