Update OBJLoader.d.ts

fixed define error

examples/jsm/loaders/OBJLoader.d.ts

@@ -10,13 +10,11 @@ import {
 export class OBJLoader {
   constructor(manager?: LoadingManager);
   manager: LoadingManager;
-  regexp: any;
   materials: MaterialCreator;
   path: string;
 
   load(url: string, onLoad: (group: Group) => void, onProgress?: (event: ProgressEvent) => void, onError?: (event: ErrorEvent) => void): void;
   parse(data: string) : Group;
-  setPath(value: string) : void;
-  setMaterials(materials: MaterialCreator) : void;
-  _createParserState() : any;
+  setPath(value: string) : this;
+  setMaterials(materials: MaterialCreator) : this;
 }