Add metadata to gemspec

strings.gemspec

@@ -9,9 +9,15 @@ Gem::Specification.new do |spec|
   spec.email         = ["me@piotrmurach.com"]
   spec.summary       = %q{A set of useful functions for transforming strings.}
   spec.description   = %q{A set of useful functions such as fold, truncate, wrap and more for transoforming strings.}
-  spec.homepage      = ""
+  spec.homepage      = "https://github.com/piotrmurach/strings"
   spec.license       = "MIT"
 
+  spec.metadata["allowed_push_host"] = "https://rubygems.org"
+  spec.metadata["changelog_uri"] = "https://github.com/piotrmurach/strings/blob/master/CHANGELOG.md"
+  spec.metadata["documentation_uri"] = "https://www.rubydoc.info/gems/strings"
+  spec.metadata["homepage_uri"] = spec.homepage
+  spec.metadata["source_code_uri"] = "https://github.com/piotrmurach/strings"
+
   spec.files         = Dir['{lib,spec}/**/*.rb', '{bin,tasks}/*', 'strings.gemspec']
   spec.files        += Dir['README.md', 'CHANGELOG.md', 'LICENSE.txt', 'Rakefile']
   spec.bindir        = "exe"