Fix duplicate key error in Vue example (#2084)
Fix duplicate key error in Vue example (#2084)

Co-authored-by: Sindre Sorhus <734af6fcbad65feee4fc3cad1b3f8a05746ffb9a@gmail.com>
slegrand45/todomvc,slegrand45/todomvc,slegrand45/todomvc,slegrand45/todomvc,slegrand45/todomvc,slegrand45/todomvc