GitlabMember => Refactor code

types/Gitlab/GitlabMember.ts

@@ -2,10 +2,10 @@ import GitlabUser from './GitlabUser';
 
 
 interface GitlabMember extends GitlabUser {
-    'access_level': number,
-    'created_at': string,
-    'created_by': GitlabUser,
-    'expires_at': string | null
+    access_level: number,
+    created_at: string,
+    created_by: GitlabUser,
+    expires_at: string | null
 }