Update the book to promote second edition

This updates the book repository, but mostly to include
https://github.com/rust-lang/book/pull/1180

TL;DR: the second edition is close enough to done that we should
universally recommend it over the first edition.
This commit is contained in:
steveklabnik 2018-02-21 13:32:24 -05:00
parent 27a046e933
commit ef48e0f2b9

@ -1 +1 @@
Subproject commit ec5660820dea91df470dab0b9eb26ef798f20889
Subproject commit 98921e9de849acdaeaed08cfad6758bb89769b7d