rust: update Cargo.lock to include @generated comment
cargo 1.34.0 of Debian sid inserts this comment, and I'm tired of reverting
the change every time I do make local.
https://github.com/rust-lang/cargo/commit/bd0e4a08471b8bc7957829b4fd294b8985d4fa2d
--- a/rust/Cargo.lock Mon Jun 17 13:21:41 2019 -0400
+++ b/rust/Cargo.lock Sat Jun 15 10:35:03 2019 +0900
@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
[[package]]
name = "aho-corasick"
version = "0.6.9"