Function zeroPad3

zeroPad3(num: number): string
Pad a number with zeros to a length of 3
Parameters
- num: number
  {number}
Returns string
zero padded number
Example
```
zeroPad3(1) // '001'
zeroPad3(10) // '010'
zeroPad3(100) // '100'
```
- Defined in number-time/src/toText.ts:35