Update podspec file

Author: mattt

InflectorKit.podspec

@@ -1,12 +1,36 @@
 Pod::Spec.new do |s|
   s.name     = 'InflectorKit'
   s.version  = '0.0.1'
-  s.license  = 'MIT'
-  s.summary  = 'Efficiently Singularize and Pluralize Strings.'
+  s.license  = { type: 'MIT', file: 'LICENSE' }
+  s.summary  = 'Get the singular and plural forms of English words.'
   s.homepage = 'https://github.com/mattt/InflectorKit'
   s.social_media_url = 'https://twitter.com/mattt'
   s.authors  = { 'Mattt' => '[email protected]' }
-  s.source   = { :git => 'https://github.com/mattt/InflectorKit.git', :tag => '0.0.1' }
-  s.source_files = 'Sources/InflectorKit'
+  s.source   = { git: 'https://github.com/mattt/InflectorKit.git', tag: "#{s.version}" }
+  s.source_files = 'Sources/**/*.{swift,h,m}'
+  s.public_header_files = [
+    'Sources/InflectorKit/include/InflectorKit.h',
+    'Sources/InflectorKit/include/NSString+InflectorKit.h',
+    'Sources/InflectorKit/include/TTTStringInflector.h'
+  ]
   s.requires_arc = true
+  s.framework = "Foundation"
+  s.pod_target_xcconfig = {
+    'APPLICATION_EXTENSION_API_ONLY' => 'YES',
+    'DEFINES_MODULE' => 'YES',
+    'ENABLE_BITCODE' => 'NO',
+    'ENABLE_TESTING_SEARCH_PATHS' => 'YES',
+    'OTHER_LDFLAGS' => '$(inherited) -Xlinker -no_application_extension',
+  }
+
+  s.ios.deployment_target = "9.0"
+  s.osx.deployment_target = "10.10"
+  s.tvos.deployment_target = '9.0'
+
+  s.cocoapods_version = '>= 1.4.0'
+  if s.respond_to?(:swift_versions) then
+    s.swift_versions = ['5.0']
+  else
+    s.swift_version = '5.0'
+  end
 end