Update changelog in preparation of release.
Update changelog in preparation of release.

abhishekgahlot/firepad,kofifus/firepad,shadowcodex/firepad-rethinkdb,missive/firepad,shadowcodex/firepad-rethinkdb,nagyistoce/firebase-firepad,nagyistoce/firebase-firepad,gching/firepad,abhishekgahlot/firepad,missive/firepad,woutie012006/firepad,Unrestricted-Coding/firepad-rethinkdb,kofifus/firepad,gching/firepad,woutie012006/firepad,Unrestricted-Coding/firepad-rethinkdb