Adding social_media_url to podspec

Author: mattt

InflectorKit.podspec

@@ -4,6 +4,7 @@ Pod::Spec.new do |s|
   s.license  = 'MIT'
   s.summary  = 'Efficiently Singularize and Pluralize Strings.'
   s.homepage = 'https://github.com/mattt/InflectorKit'
+  s.social_media_url = 'https://twitter.com/mattt'
   s.authors  = { 'Mattt Thompson' => '[email protected]' }
   s.source   = { :git => 'https://github.com/mattt/InflectorKit.git', :tag => '0.0.1' }
   s.source_files = 'InflectorKit'