Bump up the version to 0.6.3

Author: satoryu

CHANGELOG.md

@@ -1,9 +1,15 @@
 # Changelog
 
+## v0.6.3
+
 ### Bug fixes
 
 - Passing a Nokogiri::XML::Node as the second parameter to Node.new is deprecated [#121](https://github.com/ruby-docx/docx/pull/121)
 
+### Chores
+
+- Add Ruby 3.1 to the CI matrix by petergoldstein [#122](https://github.com/ruby-docx/docx/pull/122)
+
 ## v0.6.2
 
 ### Bug fixes

lib/docx/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Docx #:nodoc:
-  VERSION = '0.6.2'
+  VERSION = '0.6.3'
 end