Add swift flag and update version

WLEmptyState.podspec

@@ -1,17 +1,17 @@
 Pod::Spec.new do |s|
   s.name             = 'WLEmptyState'
-  s.version          = '1.0.0'
+  s.version          = '1.0.1'
   s.summary          = 'Custom view for Empty states on tables'
 
   s.description      = 'A control to display a place holder in case there\'s no data on a UITableView'
-
   s.homepage         = 'https://github.com/wizeline/WLEmptyState'
   s.license          = { :type => 'MIT', :file => 'LICENSE' }
   s.author           = { 'lojals' => 'jorge.ovalle@wizeline.com' }
   s.source           = { :git => 'https://github.com/wizeline/WLEmptyState.git', :tag => s.version.to_s }
 
   s.ios.deployment_target = '9.0'
   s.pod_target_xcconfig = { 'SWIFT_VERSION' => '4.0' }
+  s.swift_version    = '4.0'
   s.source_files = 'WLEmptyState/Classes/**/*'
 
   s.resource_bundles = {