Updated version hashing and bumped nu-cli to 0.18.1 (#2331)

* Updated version hashing and bumped nu-cli to 0.18.1

* made code pertyer

* Update version.rs

* Update version.rs

Co-authored-by: Jonathan Turner <jonathandturner@users.noreply.github.com>

crates/nu-cli/build.rs

@@ -1,41 +0,0 @@
-use std::path::Path;
-use std::{env, fs, io};
-
-use git2::Repository;
-
-#[derive(Debug)]
-enum Error {
-    IoError(io::Error),
-    GitError(git2::Error),
-}
-
-impl From<git2::Error> for Error {
-    fn from(git_error: git2::Error) -> Self {
-        Self::GitError(git_error)
-    }
-}
-
-impl From<io::Error> for Error {
-    fn from(io_error: io::Error) -> Self {
-        Self::IoError(io_error)
-    }
-}
-
-fn main() -> Result<(), Error> {
-    let out_dir = env::var_os("OUT_DIR").expect(
-    "\
-        OUT_DIR environment variable not found. \
-        OUT_DIR is guaranteed to to exist in a build script by cargo - see \
-        https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts\
-    ");
-    let latest_commit_hash = Repository::discover(env::current_dir()?)?
-        .head()?
-        .peel_to_commit()?
-        .id()
-        .to_string();
-
-    let commit_hash_path = Path::new(&out_dir).join("git_commit_hash");
-    fs::write(commit_hash_path, latest_commit_hash)?;
-
-    Ok(())
-}