fix: introduced forwardRef (#164)

src/muiComponents/Button/Button.tsx

@@ -0,0 +1,12 @@
+import React, { forwardRef } from 'react';
+import { default as MaterialUIButton, ButtonProps } from '@material-ui/core/Button';
+
+type ButtonRef = HTMLElementTagNameMap['button'];
+
+/* eslint-disable verdaccio/jsx-spread */
+// eslint-disable-next-line react/display-name
+const Button = forwardRef<ButtonRef, ButtonProps>(function Button(props, ref) {
+  return <MaterialUIButton {...props} ref={ref} />;
+});
+
+export default Button;

src/muiComponents/Button/index.ts

@@ -0,0 +1 @@
+export { default } from './Button';