Update changelog for 1.2.0-beta3
Update changelog for 1.2.0-beta3

influxdb/influxdb,influxdb/influxdb,li-ang/influxdb,influxdb/influxdb,mark-rushakoff/influxdb,influxdb/influxdb,influxdata/influxdb,influxdata/influxdb,mark-rushakoff/influxdb,mark-rushakoff/influxdb,influxdb/influxdb,influxdb/influxdb,nooproblem/influxdb,nooproblem/influxdb,nooproblem/influxdb,li-ang/influxdb,mark-rushakoff/influxdb,mark-rushakoff/influxdb,mark-rushakoff/influxdb,nooproblem/influxdb,nooproblem/influxdb