jekyll-linkpreview.gemspec in jekyll-linkpreview-0.2.0 vs jekyll-linkpreview.gemspec in jekyll-linkpreview-0.3.0

@@ -16,11 +16,13 @@
   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.require_paths = ["lib"]
 
-  spec.add_dependency "jekyll", "~> 3.5"
+  spec.add_dependency "jekyll", ">= 3.5", "< 4.1"
   spec.add_dependency "metainspector"
   spec.add_development_dependency "bundler", "~> 2.0"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rake", "~> 12.3.3"
   spec.add_development_dependency "rspec", "~> 3.0"
+  spec.add_development_dependency "appraisal", "~> 2.2.0"
+  spec.add_development_dependency "wwtd", "~> 1.4.1"
 end