README.md in prawn-emoji-4.2.0 vs README.md in prawn-emoji-5.0.0

@@ -1,10 +1,9 @@
 # Prawn::Emoji
 
-[![Test](https://github.com/hidakatsuya/prawn-emoji/workflows/Test/badge.svg?branch=master)](https://github.com/hidakatsuya/prawn-emoji/actions)
+[![Test](https://github.com/hidakatsuya/prawn-emoji/workflows/Test/badge.svg?branch=main)](https://github.com/hidakatsuya/prawn-emoji/actions)
 [![Gem Version](https://badge.fury.io/rb/prawn-emoji.svg)](https://badge.fury.io/rb/prawn-emoji)
-[![Maintainability](https://api.codeclimate.com/v1/badges/edcd23ef38c2e393513b/maintainability)](https://codeclimate.com/github/hidakatsuya/prawn-emoji/maintainability)
 
 Prawn::Emoji is an extention that adds Emoji support to [Prawn](https://github.com/prawnpdf/prawn).
 
 ```ruby
 require 'prawn/emoji'
@@ -22,39 +21,39 @@
 ### Emoji
 
   * Emoji is provided by [Twemoji](https://github.com/twitter/twemoji)
   * Support Singleton/Combining/Modifier/Flag/ZWJ Sequence Emoji
 
-See [test/pdf/emoji_rendering/expect.pdf](https://github.com/hidakatsuya/prawn-emoji/blob/master/test/pdf/emoji_rendering/expect.pdf) for details.
+See [test/pdf/emoji_rendering/expect.pdf](https://github.com/hidakatsuya/prawn-emoji/blob/main/test/pdf/emoji_rendering/expect.pdf) for details.
 
 ### Prawn Integration
 
   * RTL support
   * Character spacing support
   * Rotation support
   * Alignment support
   * Font size support
 
-See [test/pdf/prawn_integration/expect.pdf](https://github.com/hidakatsuya/prawn-emoji/blob/master/test/pdf/prawn_integration/expect.pdf) for details.
+See [test/pdf/prawn_integration/expect.pdf](https://github.com/hidakatsuya/prawn-emoji/blob/main/test/pdf/prawn_integration/expect.pdf) for details.
 
 ### Known Issues
 
 [prawn-emoji/issues](https://github.com/hidakatsuya/prawn-emoji/labels/known%20issue)
 
 
 ## Supported Versions
 
 ### Emoji
 
-13.0
+13.1
 
 ### Prawn
 
-2.2, 2.3, 2.4
+2.3, 2.4
 
 ### Ruby
 
-2.5, 2.6, 2.7, 3.0
+2.6, 2.7, 3.0
 
 ## Installation
 
 Add this line to your application's Gemfile: