Adding upstream version 2.2.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

testing/resources/rust_hooks_repo/.pre-commit-hooks.yaml

@@ -0,0 +1,5 @@
+-   id: rust-hook
+    name: rust example hook
+    entry: rust-hello-world
+    language: rust
+    files: ''

testing/resources/rust_hooks_repo/Cargo.lock

@@ -0,0 +1,3 @@
+[[package]]
+name = "rust-hello-world"
+version = "0.1.0"

testing/resources/rust_hooks_repo/Cargo.toml

@@ -0,0 +1,3 @@
+[package]
+name = "rust-hello-world"
+version = "0.1.0"

testing/resources/rust_hooks_repo/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("hello world");
+}