Added Control.Locate class

Control.Locate class was added to type definitions in order to access functions in ts.

types/leaflet.locatecontrol/index.d.ts

@@ -8,6 +8,12 @@ import * as L from 'leaflet';
 
 declare module 'leaflet' {
     namespace Control {
+        class Locate extends Control {
+          onAdd(map: Map): HTMLElement;
+          start(): void;
+          stop(): void;
+          setView():void;
+        }
         interface LocateOptions {
             position?: string;
             layer?: Layer;
@@ -40,6 +46,6 @@ declare module 'leaflet' {
         /**
          * Creates a Leaflet.Locate control
          */
-        function locate(options?: Control.LocateOptions): Control;
+        function locate(options?: Control.LocateOptions): Control.Locate;
     }
 }