Update example

Author: mizoR

README.md

@@ -23,7 +23,7 @@ gem 'line-bot-api'
 
 And then execute:
 
-```ruby
+```sh
 bundle
 ```
 
@@ -44,6 +44,7 @@ require 'line/bot'
 
 def client
   @client ||= Line::Bot::Client.new { |config|
+    config.channel_id = ENV["LINE_CHANNEL_ID"]
     config.channel_secret = ENV["LINE_CHANNEL_SECRET"]
     config.channel_token = ENV["LINE_CHANNEL_TOKEN"]
   }

examples/kitchensink/app.rb

@@ -9,6 +9,7 @@
 
 def client
   @client ||= Line::Bot::Client.new do |config|
+    config.channel_id = ENV["LINE_CHANNEL_ID"]
     config.channel_secret = ENV["LINE_CHANNEL_SECRET"]
     config.channel_token = ENV["LINE_CHANNEL_TOKEN"]
     config.http_options = {