Update README URLs based on HTTP redirects

[ReadmeCritic]

Created with https://github.com/dkhamsing/frankenstein

GitHub Corrected URLs

Was	Now
https://github.com/Lokaltog/powerline	https://github.com/powerline/powerline
https://github.com/adobe/source-code-pro	https://github.com/adobe-fonts/source-code-pro

HTTPS Corrected URLs

Was	Now
http://en.wikipedia.org/wiki/Typographic_ligature	https://en.wikipedia.org/wiki/Typographic_ligature
http://www.andres-loeh.de/lhs2tex/	https://www.andres-loeh.de/lhs2tex/

[i-tu]

Thank you @ReadmeCritic ! This is great.

[ReadmeCritic]

Uh ok

[i-tu]

Sorry, I'm running into problems because the repo that submitted the pull request has been deleted. It seems there is no way to reopen...

If you want credit, can you submit again? Otherwise I can just add these changes manually.

[ReadmeCritic]

Ah

Looks small enough to do manually
Let me know if you prefer I do it again

[ReadmeCritic]

For credit, you can just reference this pull 😉

[i-tu]

Cheers!