Document how to remove bindActionCreators boilerplate

[piotrwitek]

remove bindActionCreators boilerplate using object literal with actions instead of mapDispatchToProps function

const stateToProps = (storeState: IRootReducer) => ({ 
  currencyRates: storeState.currencyRates, 
  currencyConverter: storeState.currencyConverter 
}); 

const actionsToProps = Object.assign({}, currencyConverterActions); 

export default connect(stateToProps, actionsToProps)(CurrencyConverterContainer);