Updating Changelog for 3.1.0 release.
Updating Changelog for 3.1.0 release.

Intendit/bolt,rarila/bolt,lenvanessen/bolt,lenvanessen/bolt,electrolinux/bolt,GawainLynch/bolt,nikgo/bolt,electrolinux/bolt,HonzaMikula/masivnipostele,lenvanessen/bolt,joshuan/bolt,joshuan/bolt,HonzaMikula/masivnipostele,Intendit/bolt,rarila/bolt,bolt/bolt,bolt/bolt,nikgo/bolt,lenvanessen/bolt,HonzaMikula/masivnipostele,romulo1984/bolt,GawainLynch/bolt,rarila/bolt,GawainLynch/bolt,nikgo/bolt,romulo1984/bolt,electrolinux/bolt,romulo1984/bolt,joshuan/bolt,romulo1984/bolt,rarila/bolt,joshuan/bolt,Intendit/bolt,Intendit/bolt,GawainLynch/bolt,electrolinux/bolt,nikgo/bolt,HonzaMikula/masivnipostele,bolt/bolt,bolt/bolt