Incorrect link on the atlasboard.bitbucket.org page

[Aleksander Mierzwicki ☁]

The text: You can install packages easily as git submodules.

Points to: http://http//git-scm.com/book/en/Git-Tools-Submodules

<a href="http://http://git-scm.com/book/en/Git-Tools-Submodules" target="_blank" title="git submodules">git submodules</a>

[Iván Loire]

thanks, fixed!