feat(file-chooser): add missing options param (#3136)

added missing optional parameter to support mime types

src/@ionic-native/plugins/file-chooser/index.ts

@@ -1,6 +1,13 @@
 import { Injectable } from '@angular/core';
 import { Cordova, IonicNativePlugin, Plugin } from '@ionic-native/core';
 
+export interface FileChooserOptions {
+    /**
+     * comma seperated mime types to filter files.
+     */
+    mime: string;
+}
+
 /**
  * @name File Chooser
  * @description
@@ -20,6 +27,8 @@ import { Cordova, IonicNativePlugin, Plugin } from '@ionic-native/core';
  *   .catch(e => console.log(e));
  *
  * ```
+ * @interfaces
+ * FileChooserOptions
  */
 @Plugin({
   pluginName: 'FileChooser',
@@ -33,10 +42,11 @@ export class FileChooser extends IonicNativePlugin {
 
   /**
    * Open a file
+   * @param {FileChooserOptions} [options]  Optional parameter, defaults to ''. Filters the file selection list according to mime types
    * @returns {Promise<string>}
    */
   @Cordova()
-  open(): Promise<string> {
+  open(options?: FileChooserOptions): Promise<string> {
     return;
   }