[Auth] yesod-auth-bcrypt link in readme is dead

[smichel17]

I get a status 404 at https://github.com/ollieh/yesod-auth-bcrypt/. A quick web search found https://github.com/TobyGoodwin/yesod-auth-bcrypt as the fork that seems most up to date. It's still not updated since 2015, but maybe it's simply complete; I'm a newcomer to the Haskell ecosystem, so I don't know the state of most anything.

Along similar lines, I'm not sure who to tell that the yesod-auth-account hackage page links to a bitbucket repo which also 404s.

yesod/yesod-auth/README.md

Lines 9 to 11 in dfc270b

	* [yesod-auth-account](http://hackage.haskell.org/package/yesod-auth-account): An account authentication plugin for Yesod
	* [yesod-auth-hashdb](http://www.stackage.org/package/yesod-auth-hashdb): The HashDB module previously packaged in yesod-auth, now with stronger, but compatible, security.
	* [yesod-auth-bcrypt](https://github.com/ollieh/yesod-auth-bcrypt/): An alternative to the HashDB module.

[psibi]

Thanks for pointing this out! I guess the broken links could be updated to either stackage or hackage link if there is a confusion links.

In general, my recommendation is to rely on the official sources and use this OAuth plugin: https://hackage.haskell.org/package/yesod-auth-oauth2-0.6.3.4

Adding the above link in README would be nice. PR's welcome. :-)