//App.js:
...
connect(mapStateToProps, { fetchData })(App)

//ActionCreator:
export const fetchData = () => (dispatch) => {
  dispatch({type: FETCHING_DATA})
  getPeople()
    .then(data => dispatch({type: FETCHING_DATA_SUCCESS, payload: data}))
    .catch(er => dispatch({type: FETCHING_DATA_FAILURE}))
}