Auto merge of #5317 - konstin:patch-1, r=matklad
authorbors <bors@rust-lang.org>
Sat, 7 Apr 2018 18:58:39 +0000 (18:58 +0000)
committerbors <bors@rust-lang.org>
Sat, 7 Apr 2018 18:58:39 +0000 (18:58 +0000)
commit681756252b718c4e638b3b8004bdc068b5529ae3
treed77d87e108cec067e1c5e45f2e205bb1d84ac9a9
parent9015109e6dabcc9da036713e0510f05347e57b01
parent9a771c9d82642806a11eab5f261e9f7b0d9a3e7d
Auto merge of #5317 - konstin:patch-1, r=matklad

Add link to the sources of the book

It's quite hard to find the folder with the sources of the book, so I added the link to the introduction.