Updated CHANGELOG.
Updated CHANGELOG.

googleapis/signet,rhenry1989/signet,rusikf/signet,Gataniel/signet,rhenry1989/signet,yakimaherald/signet_original,tacho/oauth-signet,rusikf/signet,Gataniel/signet,mjobin-mdsol/oauth-signet,rhenry1989/signet,tacho/oauth-signet,googleapis/signet,jonahglover/signet,googleapis/signet,Gataniel/signet,jonahglover/signet,jonahglover/signet,rusikf/signet