Update podspec.

PanModal.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'PanModal'
-  s.version          = '1.0.1'
+  s.version          = '1.0.2'
   s.summary          = 'PanModal is an elegant and highly customizable presentation API for constructing bottom sheet modals on iOS.'
 
 # This description is used to generate tags and improve search results.
@@ -24,5 +24,6 @@ Pod::Spec.new do |s|
   s.source           = { :git => 'https://github.com/slackhq/PanModal.git', :tag => s.version.to_s }
   s.social_media_url = 'https://twitter.com/slackhq'
   s.ios.deployment_target = '10.0'
+  s.swift_version = '4.2'
   s.source_files = 'PanModal/**/*'
 end