Merge pull request #32 from sgryjp/feat/bump-clap-version-to-4

Bump clap version to 4

.gitignore

@@ -1,18 +1,4 @@
-# Generated by Cargo
-# will have compiled files and executables
-debug/
 target/
 
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
-
-# These are backup files generated by rustfmt
-**/*.rs.bk
-
-# MSVC Windows builds of rustc generate these, which store debugging information
-*.pdb
-
-# Project specific patterns
 .vscode/
-/temp/
+temp/

CHANGELOG.md

@@ -2,8 +2,19 @@
 
 # Change Log
 
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to
+[Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
 ## Unreleased
 
+### Changed
+
+- Bump [clap](https://crates.io/crates/clap) version to 4.
+  This changes appearance of help message.
+
 ### Fixed
 
 - Correct a typo in the command line help.