fix(gform): switch to Component

src/components/banner/Gform.jsx

@@ -1,12 +1,13 @@
 /* eslint react/prop-types: 0 */
-import React from "react";
+import React, { Component } from "react";
 import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
 import { faGoogleDrive } from "@fortawesome/free-brands-svg-icons";
 
-const Gform = props => {
+class Gform extends Component {
+  render () {
     return (
       <a
-      className={props.className}
+        className={this.props.className}
         href={this.context.feedbackForm}
         target="_blank"
         rel="noopener noreferrer"
@@ -15,6 +16,7 @@ const Gform = props => {
         Votre avis nous intéresse !
       </a>
     );
+  }
 };
 
 export default Gform;