Function round

round(num, dec?): number
round a value to the specified number of digit
Parameters
- num: number
  value to be rounded.
- Optionaldec: number = 0
  number of decimal digit to be rounded to.
Returns number
rounded value
Example
```
// round a specific value to 2 digits
math.round(10.33333, 2); // return 10.33
```
- Defined in packages/melonjs/src/math/math.ts:160