Update CHANGELOG to mention adding boolean threshold alerts
Update CHANGELOG to mention adding boolean threshold alerts

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