Process a pool asynchronously

[cpapidas]

After big API changes how we can process a pool asynchronously?

Also what about callback functions?

TIP for author: When you change the lib API you have to respect your users and

1. don't make brake changes if not necessary
2. keep the same feature as before unless you did some terrible wrong before.
3. if you did the 1 and 2 it's ok but the first thing that you have to do is to create a migration guide!

Please, answer the 2 question above!

[Jeffail]

Hey @cpapidas,

Migration guide: #19
For your specific question: #21

[wpecker]

@cpapidas I realize that asynchronous pool, with cache

https://github.com/penhauer-xiao/gpool