export const login = ({username, password}) => {
return (dispatch) => {
    dispatch({type: LOGIN_START});
    fetch('https://***', {
        method: 'POST',
        headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({username: username, password: password})
    }).then((response) => {
        console.log(response);
        if (!response.ok) {
            throw Error("Error during login");
        }
        return response.json();
    }).then((responseJson) => {
        dispatch({
            type: LOGIN_SUCCESS,
            payload: {
                token: user.token
            }
        });
    }).catch((error) => {
        dispatch({type: LOGIN_FAIL, payload: error});
    });
}

case LOGIN_SUCCESS:
        return {
            ...state,
            token: action.payload.token,
            loading: false
        }

componentWillReceiveProps(){
    if (this.props.token){
        Actions.main();
    }
}

case LOGIN_SUCCESS:
Actions.main();
return {
    ...state,
    token: action.payload.token,
    loading: false
}