Use buffered channel instead of list.List in object pool example?

[Ammar Bandukwala]

Instead of a list, using channels and select as demonstrated here makes for a much more beautiful demonstration.

[Tamer Tas]

The goal of this repository to present common patterns in a very simple manner and I agree with your assessment, thank you for your suggestion!

[Tamer Tas]

I tried to make the object pool as simple as possible here 6a717fe.

I'm not sure if its too simple or it gets the job done, so please let me know if you have any thoughts on it.