Update broken links to djangorestframework-jwt docs

[enbacode]

the maintainer of djangorestframework-jwt changed their username, so hyperlinks to the github docs were broken. Also changed protocol from http to https

[coveralls]

Coverage remained the same at 96.044% when pulling 8825f6b on enbacode:patch-2 into 624ad01 on Tivix:master.

[BarnabasSzabolcs]

Hi,
as a user of rest-auth, thanks for the contribution!
This repo is not maintained anymore, so the development moved to dj-rest-auth. (reference: #568)
It may be best, if you move this PR there. (and upgrade to using dj_rest_auth)

new repo link: https://github.com/jazzband/dj-rest-auth (I'm not the upkeeper of that repo, it just makes sense for me to help you merge your PR)

Many Thanks,
Barney