fix bluebird dependency

lib/plugins/influxdb/sender.js

@@ -15,15 +15,15 @@ class InfluxDBSender {
   }
 
   send(data) {
-    return Promise.resolve(data)
-      .map(point => {
-        return {
-          tags: point.tags,
-          measurement: point.seriesName,
-          fields: point.point
-        };
-      })
-      .then(points => this.client.writePoints(points));
+    const points = [];
+    for (let point of data) {
+      points.push({
+        tags: point.tags,
+        measurement: point.seriesName,
+        fields: point.point
+      });
+    }
+    return this.client.writePoints(points);
   }
 }