Update Cargo.lock

Author: flip1995

Cargo.lock

@@ -379,6 +379,7 @@ dependencies = [
  "compiletest_rs 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "derive-new 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libtest 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-workspace-hack 1.0.0",
  "rustc_tools_util 0.1.1",