mdBook: update to 0.1.5.

Closes: #12607 [via git-merge-pr]

srcpkgs/mdBook/template

@@ -1,6 +1,6 @@
 # Template file for 'mdBook'
 pkgname=mdBook
-version=0.1.4
+version=0.1.5
 revision=1
 hostmakedepends="cargo"
 short_desc="Create book from markdown files. Like Gitbook but implemented in Rust"
@@ -8,7 +8,7 @@ maintainer="Huidong Hwang <hwangh95@gmail.com>"
 license="MPL-2.0"
 homepage="https://github.com/rust-lang-nursery/${pkgname}"
 distfiles="https://github.com/rust-lang-nursery/${pkgname}/archive/v${version}.tar.gz"
-checksum=627ec933dd810e8971f0906cab86b032d963086becf69b016d98f1b01e9d7213
+checksum=a93f68f834e9175e1d05edf86aa9c996fbe52ac449a0dc27949c83ffc675449b
 nocross="This cannot be cross compiled due to limitations in cargo."
 
 do_build() {