refactor(ui): bump tsconfig target
refactor(ui): bump tsconfig target

The latest version of Chrome, Firefox, Safari, and Edge support ES2017.

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