Update Gemfile and qiita-markdown.gemspec to adopt Gemspec/DevelopmentDependencies

Author: getty104

Gemfile

@@ -2,3 +2,12 @@ source "https://rubygems.org"
 
 # Specify your gem's dependencies in qiita-markdown.gemspec
 gemspec
+
+gem "activesupport", "~> 5.2.7"
+gem "bundler"
+gem "codeclimate-test-reporter", "0.4.4"
+gem "pry"
+gem "rake"
+gem "rspec", "~> 3.1"
+gem "rubocop", "~> 1.60.2"
+gem "simplecov", "!= 0.18.0", "!= 0.18.1", "!= 0.18.2", "!= 0.18.3", "!= 0.18.4", "!= 0.18.5", "!= 0.19.0", "!= 0.19.1"

qiita-markdown.gemspec

@@ -25,13 +25,5 @@ Gem::Specification.new do |spec|
   spec.add_dependency "qiita_marker", "~> 0.23.9"
   spec.add_dependency "rouge", "~> 4.1.0"
   spec.add_dependency "sanitize"
-  spec.add_development_dependency "activesupport", "~> 5.2.7"
-  spec.add_development_dependency "bundler"
-  spec.add_development_dependency "codeclimate-test-reporter", "0.4.4"
-  spec.add_development_dependency "pry"
-  spec.add_development_dependency "rake"
-  spec.add_development_dependency "rspec", "~> 3.1"
-  spec.add_development_dependency "rubocop", "~> 1.60.2"
-  spec.add_development_dependency "simplecov", "!= 0.18.0", "!= 0.18.1", "!= 0.18.2", "!= 0.18.3", "!= 0.18.4", "!= 0.18.5", "!= 0.19.0", "!= 0.19.1"
   spec.metadata["rubygems_mfa_required"] = "true"
 end