Modifs schéma GraphQL

src/index.js

 import server from './server';
 import router from './admin_view/admin_view';
 import colors from 'colors';
-import path from 'path';
 
 /**
  * @file index

src/server.js

@@ -43,9 +43,11 @@ const typeDefs = `
     }
 
     type Group {
-        name: String
-        id: Int
-        school: String
+        name: String!
+        id: ID!
+        updatedAt: String!
+        description: String
+        school: String!
     }
 `;