Change repotitory url for mellium.im/sasl package

[killer-djon]

Hi, merge please this commit, it's changes only one package mellium beacouse this package has been moved and current url it's deprecated #1060

[killer-djon]

This pull request resolve conflicts like this

Fetching https://mellium.im/sasl?go-get=1
https fetch failed: Get https://mellium.im/sasl?go-get=1: EOF
package mellium.im/sasl: unrecognized import path "mellium.im/sasl" (https fetch: Get https://mellium.im/sasl?go-get=1: EOF)

[elliotcourant]

Please add this to your local global git ignore. It's unnecessary to have it here.

You can read more about it here: http://egorsmirnov.me/2015/05/04/global-gitignore-file.html

[elliotcourant]

This also just seems to add a new error.

$ go get github.com/mellium/sasl
package github.com/mellium/sasl: code in directory /home/travis/gopath/src/github.com/mellium/sasl expects import "mellium.im/sasl"