Add precision

[PaulWoitaschek]

SVGO supports setting a precision value:
-p PRECISION, --precision=PRECISION : Set number of digits in the fractional part, overrides plugins params

I often see lint warnings because my vector paths are too long. It suggests me to decrease the float precision. It would be great if avocado supported this too.
Together with rewriting paths this could decrease the complexity of the vector quite a bit.

[valeriyo]

Yes, default precision is 3 decimals, and usually 1 is quite enough.

[emartynov]

I'm not an expert in JS. I plan to look into https://github.com/alexjlockwood/avocado/blob/master/src/plugins/convertPathData.ts and play with precision. If it works I will try to make it as an option.