WindowSize's defaultProps mispells throttle property as debounce

[Victor Magalhães]

WindowSize component's Props are defined as follows:

export interface WindowSizeConfig {
  throttle?: number;
}

But later on, when defaultProps is defined, throttle property is mispelled as debounce:

static defaultProps = {
  debounce: 100,
};

So that, if the throttle property is not given, undefined will be passed to setTimeout inside the throttle utility function. In my browser (Firefox 58.0b6), it behaves the same as if I had given a timeout of 0.