bugfix-SpeechConstant

Author: zphhhhh

index.js

@@ -2,6 +2,7 @@
 import React, { NativeModules } from "react-native";
 
 module.exports = {
+  SpeechConstant: NativeModules.SpeechConstantModule,
   Recognizer: NativeModules.SpeechRecognizerModule,
   Synthesizer: NativeModules.SpeechSynthesizerModule
 };