0.8.0: update CHANGELOG
0.8.0: update CHANGELOG

kinvolk/scope,mbrukman/scope,mbrukman/scope,dilgerma/scope,kinvolk/scope,dilgerma/scope,alban/scope,kinvolk/scope,weaveworks/scope,kinvolk/scope,alban/scope,alban/scope,alban/scope,mbrukman/scope,weaveworks/scope,weaveworks/scope,paulbellamy/scope,paulbellamy/scope,paulbellamy/scope,paulbellamy/scope,dilgerma/scope,mbrukman/scope,dilgerma/scope,dilgerma/scope,weaveworks/scope,paulbellamy/scope,paulbellamy/scope,kinvolk/scope,alban/scope,alban/scope,weaveworks/scope,kinvolk/scope,mbrukman/scope,mbrukman/scope,dilgerma/scope,weaveworks/scope