Incorrect dot handler for input with decimalScale=0

[sergei97k]

Hi, thank you for your library. It looks cool.

I found the problem when I created the component with the property decimalScale.
Steps to reproduce:

1. Create the NumberFormat component with next props:

<NumberFormat 
     value={4200} 
     thousandSeparator={true}
     decimalScale={0}
/>

2. Try to press or paste the dot symbol between zeros
3. Last zero symbol was removed

You can see my example here

P.S. I resolved this issue. I added the property decimalSeparator={null}. But I'm not sure, that it's the clear solution (because decimalSeparator should get only "string" type).