Remove unused import

OhmGraphite/InfluxWriter.cs

@@ -2,7 +2,6 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
-using InfluxDB.LineProtocol;
 using InfluxDB.LineProtocol.Client;
 using InfluxDB.LineProtocol.Payload;
 using NLog;