CHANGELOG.md in toycol-0.3.1 vs CHANGELOG.md in toycol-1.0.0

@@ -1,5 +1,18 @@
+# Changelog
+
+All notable changes to this project will be documented in this file. For info on how to format all future additions to this file please reference [Keep A Changelog](https://keepachangelog.com/en/1.0.0/).
+
 ## [Unreleased]
 
-## [0.0.1] - 2021-07-12
+## [1.0.0] - 2021-07-27
 
-- Initial release
+The first major release of Toycol.The main features are:
+
+- [Added] Toycol::Protocol - For defining orignal application protocol
+- [Added] Toycol::Proxy - For accepting requests and pass them to the background server
+- [Added] Toycol::Command - For user friendly CLI
+  - `$ toycol server` - For starting proxy & background server
+  - `$ toycol client` - For sending request message to server
+  - `$ toycol generate` - For generating skeletons of Protocolfile & application
+- [Added] Toycol::Server - As a built-in background server
+- [Added] Rack::Handler::Toycol - For running Rack compartible application & switching background server