100% increase when running time is `0 ms`

[SalimBensiali]

First of all thanks for this action and the cli tool.

I am noticing a consistent 0 ms (+100% 🔺). Is this expected?

See screen grab below

[SalimBensiali]

I found this is due to the case of comparing against an initial value of 0, where coming up with a percentage increase value is tricky. Currently the code reports +100% 🔺. I have raised a PR fix where I think the suggested resolution is an improvement See https://github.com/andresz1/size-limit-action/pull/102. Basically the reported percentage increase will be:

• 0% if the both the previous and current values are 0, or
• +∞% 🔺 if the previous value is 0 and the current is not 0

[SalimBensiali]

@andresz1 any thoughts on this?