Mercurial does not like TLS

It looks like mercurial does not like TLS...
I wrote a hacky fix in the PR I'm gonna do
```
abort: error: [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:581)
ERROR: Service 'web' failed to build: The command '/bin/sh -c cd /usr/src && hg clone http://bitbucket.org/Svedrin/mumble-django && mv mumble-django app' returned a non-zero code: 255
```