update: README.md

README.md

@@ -1,45 +1,63 @@
 # LINE Messaging API SDK for Rust
+
 ## Introduction
+
 The LINE Messaging API SDK for Rust makes it easy to develop bots using LINE Messaging API, and you can create a sample bot within minutes.
+
 ## Documentation
+
 See the official API documentation for more information.
+
 - English: <https://developers.line.biz/en/docs/messaging-api/overview/>
 - Japanese: <https://developers.line.biz/ja/docs/messaging-api/overview/>
+
 ## Requirements
+
 This library requires Rust nightly.
+
 ## Installation
-```
+
+```toml
 [dependencies]
 line-bot-sdk-rust = "0.1"
 ```
+
 If you use `rocket support`.
-```
+
+```toml
 [dependencies]
 line-bot-sdk-rust = { version = "0.1", features = ["rocket_support"] }
 ```
+
 If you use `actix_web support`.
-```
+
+```toml
 [dependencies]
 line-bot-sdk-rust = { version = "0.1", features = ["actix_support"] }
 ```
+
 ## Configuration
-```
+
+```rust
 extern crate line_bot_sdk_rust as line;
 use line::bot::LineBot;
 
 fn main() {
     let bot = LineBot::new("<channel secret>", "<channel access token>");
 }
 ```
+
 ## How to use
+
 The LINE Messaging API uses the JSON data format.
 parse_event_request() will help you to parse the HttpRequest content and return a Result<[Events](`events::Events`) , &'static str> Object.
-```
+
+```rust
  let result: Result<Events, &'static str> =
      bot.parse_event_request(signature, body);
 ```
 
-```
+```rust
 match result {
     Ok(events) => {
         for event in events.events {
@@ -52,15 +70,15 @@ match result {
 
 ## EchoBot examples
 
-**with Rocket framework**
+### with Rocket framework
 
 ```bash
 cargo run --example echobot_rocket --features=rocket_support
 ```
 
 source: [rocket example](./examples/echobot_rocket.rs)
 
-**with Actix_web framework**
+### with Actix_web framework
 
 ```bash
 cargo run --example echobot_actix_web --features=actix_support
@@ -69,10 +87,12 @@ cargo run --example echobot_actix_web --features=actix_support
 source: [actix_web example](./examples/echobot_actix_web.rs)
 
 ## Contributing
+
 Please make a contribution 😆
 
 ## License
-```
+
+```plain
 Copyright 2021 nanato12
 
 Licensed under the Apache License, Version 2.0 (the "License");