[crate] Add toml 0.4

Change-Id: I5157102396ea6f8a80511d2b2eba606eaa8c3e86
diff --git a/rustc_deps/Cargo.lock b/rustc_deps/Cargo.lock
index d6cf877..fb1f42f 100644
--- a/rustc_deps/Cargo.lock
+++ b/rustc_deps/Cargo.lock
@@ -262,6 +262,7 @@
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "timebomb 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "toml 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-segmentation 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-width 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/rustc_deps/Cargo.toml b/rustc_deps/Cargo.toml
index 19f6729..0f63b28 100644
--- a/rustc_deps/Cargo.toml
+++ b/rustc_deps/Cargo.toml
@@ -41,6 +41,7 @@
 tempdir = "0.3"
 time = "0.1"
 timebomb = "0.1.2"
+toml = "0.4"
 unicode-segmentation = "1.0"
 unicode-width = "0.1.3"
 url = "1.7.0"