toOrdinal returns incorrect results for some negative numbers (-11, -12, -13)

[dmrzn]

I've found the issue with negative numbers:

var numberToWords = require("number-to-words")
console.log(numberToWords.toOrdinal(-11))
console.log(numberToWords.toOrdinal(-12))
console.log(numberToWords.toOrdinal(-13))

returns:

-11st
-12nd
-13rd

[marlun78]

Ouch! This needs fixing ASAP, thanks for the report @dmrzn!