Release 9 4 7 (#601)

* Release 9.4.7

* Update release notes

* update a changelog

Author: KazuCocoa

CHANGELOG.md

@@ -3,6 +3,14 @@ Commit based release not is [release_notes.md](./release_notes.md)
 
 Release tags are https://github.com/appium/ruby_lib/releases .
 
+## v9.4.7
+### 1. Enhancements
+
+### 2. Bug fixes
+- fix raise 500 error by `driver.remote_status` in `appium_server_version` [#599](https://github.com/appium/ruby_lib/issues/599)
+
+### 3. Deprecations
+
 ## v9.4.6
 ### 1. Enhancements
 

appium_lib.gemspec

@@ -28,6 +28,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'yard', '~> 0.8'
 
   s.add_development_dependency 'rubocop', '~> 0.46.0'
+  s.add_development_dependency 'rainbow', '~> 2.1.0'
   s.add_development_dependency 'pry'
 
   s.files = `git ls-files`.split("\n").select { |v| !v.match /\A^(ios_tests|android_tests|grid)\/.+/ }