Clean gemspec

Gemfile

@@ -13,4 +13,9 @@ else
 end
 
 gem "activerecord", "~> #{rails_version}"
+
+gem "rake", "~> 13.0"
+gem "rspec", "~> 3.0"
+gem "simplecov", "~> 0.17.1"
+gem "database_cleaner", "~> 2.0.0"
 gem "pry"

tapping_device.gemspec

@@ -15,24 +15,16 @@ Gem::Specification.new do |spec|
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = "https://github.com/st0012/tapping_device"
-  spec.metadata["changelog_uri"] = "https://github.com/st0012/tapping_device/releases"
+  spec.metadata["changelog_uri"] = "https://github.com/st0012/tapping_device/CHANGELOG.md"
 
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
   spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
     `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
   end
-  spec.bindir        = "exe"
-  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
   spec.add_dependency "method_source", "~> 1.0.0"
   spec.add_dependency "activesupport"
   spec.add_dependency "pastel"
-
-  spec.add_development_dependency "database_cleaner"
-  spec.add_development_dependency "bundler", "~> 2.0"
-  spec.add_development_dependency "rake", "~> 13.0"
-  spec.add_development_dependency "rspec", "~> 3.0"
-  spec.add_development_dependency "simplecov", "0.17.1"
 end