Fix new JSZip() and JSZip#loadAsync types

* Constructor no longer takes arguments.
* `loadAsync()` can take a `Promise`.

Author: Peeja

index.d.ts

@@ -56,7 +56,7 @@ interface OutputByType {
 //     compressedContent: string|ArrayBuffer|Uint8Array|Buffer;
 // }
 
-type InputFileFormat = InputByType[keyof InputByType];
+type InputFileFormat = InputByType[keyof InputByType] | Promise<InputFileFormat>;
 
 declare namespace JSZip {
     type InputType = keyof InputByType;
@@ -245,15 +245,7 @@ interface JSZip {
     /**
      * Create JSZip instance
      */
-
-    /**
-     * Create JSZip instance
-     * If no parameters given an empty zip archive will be created
-     *
-     * @param data Serialized zip archive
-     * @param options Description of the serialized zip archive
-     */
-    new (data?: InputFileFormat, options?: JSZip.JSZipLoadOptions): this;
+    new(): this;
 
     (): JSZip;