Fix warnings

src/components/UI/Button/Button.js

@@ -1,7 +1,7 @@
 import React from 'react';
 import './Button.css';
 
-export default props => {
+const Button = props => {
   return (
     <button disabled={props.disabled}
             autoFocus={props.autoFocus}
@@ -11,3 +11,4 @@ export default props => {
   );
 };
 
+export default Button;