deps: relax runtime requirements on Ruby 2.7+

Author: bf4

rspec_api_documentation.gemspec

@@ -18,25 +18,47 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency "activesupport", ">= 3.0.0"
   s.add_runtime_dependency "mustache", "~> 1.0", ">= 0.99.4"
 
-  s.add_development_dependency "bundler", ">= 1.16"
-  s.add_development_dependency "fakefs", "~> 0.6.0"
-  s.add_development_dependency "sinatra", "~> 2.0.8"
-  s.add_development_dependency "aruba", "~> 0.14.14"
-  s.add_development_dependency "capybara", "~> 3.39.2"
-  s.add_development_dependency "rake", "~> 13.2.1"
-  s.add_development_dependency "rack-test", "~> 0.6.3"
-  s.add_development_dependency "rack-oauth2", "~> 1.12.0"
-  s.add_development_dependency "webmock", "~> 3.23.0"
-  s.add_development_dependency "rspec-its", "~> 1.3.0"
-  s.add_development_dependency "faraday", "~> 0.9.2"
-  s.add_development_dependency "nokogiri", "~> 1.8.4"
-  s.add_development_dependency "yard", "~> 0.9.15"
-  s.add_development_dependency "inch", "~> 0.8.0"
-  s.add_development_dependency "minitest", "~> 5.8.4"
-  s.add_development_dependency "contracts", "~> 0.17"
-  s.add_development_dependency "gherkin", "~> 9.0.0"
-  s.add_development_dependency "multi_json", "~> 1.15.0"
-  s.add_development_dependency "rspec", "~> 3.0"
+  if RUBY_VERSION < '2.7'
+    s.add_development_dependency "bundler", ">= 1.16"
+    s.add_development_dependency "fakefs", "~> 0.6.0"
+    s.add_development_dependency "sinatra", "~> 2.0.8"
+    s.add_development_dependency "aruba", "~> 0.14.14"
+    s.add_development_dependency "capybara", "~> 3.39.2"
+    s.add_development_dependency "rake", "~> 13.2.1"
+    s.add_development_dependency "rack-test", "~> 0.6.3"
+    s.add_development_dependency "rack-oauth2", "~> 1.12.0"
+    s.add_development_dependency "webmock", "~> 3.23.0"
+    s.add_development_dependency "rspec-its", "~> 1.3.0"
+    s.add_development_dependency "faraday", "~> 0.9.2"
+    s.add_development_dependency "nokogiri", "~> 1.8.4"
+    s.add_development_dependency "yard", "~> 0.9.15"
+    s.add_development_dependency "inch", "~> 0.8.0"
+    s.add_development_dependency "minitest", "~> 5.8.4"
+    s.add_development_dependency "contracts", "~> 0.17"
+    s.add_development_dependency "gherkin", "~> 9.0.0"
+    s.add_development_dependency "multi_json", "~> 1.15.0"
+    s.add_development_dependency "rspec", "~> 3.0"
+  else
+    s.add_development_dependency "bundler", ">= 1.16"
+    s.add_development_dependency "fakefs"
+    s.add_development_dependency "sinatra"
+    s.add_development_dependency "aruba"
+    s.add_development_dependency "capybara"
+    s.add_development_dependency "rake"
+    s.add_development_dependency "rack-test"
+    s.add_development_dependency "rack-oauth2"
+    s.add_development_dependency "webmock"
+    s.add_development_dependency "rspec-its"
+    s.add_development_dependency "faraday"
+    s.add_development_dependency "nokogiri"
+    s.add_development_dependency "yard"
+    s.add_development_dependency "inch"
+    s.add_development_dependency "minitest"
+    s.add_development_dependency "contracts"
+    s.add_development_dependency "gherkin"
+    s.add_development_dependency "multi_json"
+    s.add_development_dependency "rspec", "~> 3.0"
+  end
 
   s.files        = Dir.glob("lib/**/*") + Dir.glob("templates/**/*")
   s.require_path = "lib"