fix(dependencies): add support for no bundler

warframe.gemspec

@@ -26,17 +26,19 @@ Gem::Specification.new do |spec|
   # 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(__dir__)) do
-    `git ls-files -z lib README.md *.txt .yardopts`.split("\x0")
+    `git ls-files -z lib *.gemspec README.md CHANGELOG.md *.txt .yardopts`.split("\x0")
   end
 
   # Dependencies
   spec.required_ruby_version = '>= 2.5.0'
-  spec.add_dependency 'fast_underscore', '~> 0.3.2'
-  spec.add_dependency 'http', '~> 5.0', '>= 5.0.4'
-  spec.add_dependency 'json', '~> 2.6', '>= 2.6.1'
-  spec.add_development_dependency 'bundler', '~> 2.1'
-  spec.add_development_dependency 'rspec', '~> 3.10'
-  spec.add_development_dependency 'rubocop', '~> 1.22'
-  spec.add_development_dependency 'thor', '~> 1.1.0'
-  spec.add_development_dependency 'yard', '~> 0.9.26'
+  spec.add_dependency 'fast_underscore', '~> 0.3'
+  spec.add_dependency 'http', '~> 5.0'
+  spec.add_dependency 'json', '~> 2.6'
+
+  # Development Dependencies
+  spec.add_development_dependency 'bundler', '~> 2.0'
+  spec.add_development_dependency 'rspec', '~> 3.9'
+  spec.add_development_dependency 'rubocop', '~> 1.24'
+  spec.add_development_dependency 'thor', '~> 1.1'
+  spec.add_development_dependency 'yard', '~> 0.9'
 end