Update mdbook

Cargo.lock

@@ -1698,7 +1698,7 @@ dependencies = [
  "regex",
  "serde",
  "serde_json",
- "shlex",
+ "shlex 0.1.1",
 ]
 
 [[package]]
@@ -2053,9 +2053,9 @@ dependencies = [
 
 [[package]]
 name = "mdbook"
-version = "0.4.6"
+version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b3d948b64449003363127ed6c6139f03273982c3fe97da4cb3dee933e38ce38f"
+checksum = "28f6a882f3880ec68e96f60d6b543c34941e2f307ad10e2992e4db9acfe96529"
 dependencies = [
  "ammonia",
  "anyhow",
@@ -2073,7 +2073,7 @@ dependencies = [
  "serde",
  "serde_derive",
  "serde_json",
- "shlex",
+ "shlex 1.0.0",
  "tempfile",
  "toml",
 ]
@@ -4751,6 +4751,12 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7fdf1b9db47230893d76faad238fd6097fd6d6a9245cd7a4d90dbd639536bbd2"
 
+[[package]]
+name = "shlex"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42a568c8f2cd051a4d283bd6eb0343ac214c1b0f1ac19f93e1175b2dee38c73d"
+
 [[package]]
 name = "signal-hook-registry"
 version = "1.2.1"