Auto merge of #269 - RalfJung:RalfJung-patch-1, r=jdm
Auto merge of #269 - RalfJung:RalfJung-patch-1, r=jdm

Clarify crate docs re: kernel version

I was briefly confused here because it was not clear whether this was version 3.17 of this crate or something else.

servo/ipc-channel