Update src/actions/challenges.js

Co-authored-by: Marcin Flotyński <mflotynski@gmail.com>

Author: yoution

src/actions/challenges.js

@@ -206,10 +206,7 @@ export function loadChallengeDetails (projectId, challengeId) {
  */
 export function loadGroupDetails (groupIds) {
   return (dispatch, getState) => {
-    const promiseAll = []
-    groupIds.forEach(id => {
-      promiseAll.push(fetchGroupDetail(id))
-    })
+    const promiseAll = groupIds.map(id => fetchGroupDetail(id));
     return dispatch({
       type: LOAD_GROUP_DETAIL,
       payload: Promise.all(promiseAll).then(groups => {