Merge pull request #44 from julderen/master

fix error 'React' refers to a UMD global, but the current file is a m…

Author: suweya

src/index.d.ts

@@ -1,3 +1,5 @@
+import React from 'react';
+
 interface ReactCodeInputProps {
   type?: 'text' | 'number';
   onChange?: (val: string) => void;