updated podspec

Material.podspec

@@ -2,7 +2,7 @@ Pod::Spec.new do |s|
   s.name = 'Material'
   s.version = '1.31.3'
   s.license = 'BSD'
-  s.summary = 'Material is a graphics and animation framework. It may be used for Google's Material Design and Apple's Flat UI.'
+  s.summary = 'Material is a graphics and animation framework. It may be used for Google\'s Material Design and Apple\'s Flat UI.'
   s.homepage = 'http://cosmicmind.io'
   s.social_media_url = 'https://www.facebook.com/graphkit'
   s.authors = { 'CosmicMind, Inc.' => 'support@cosmicmind.io' }