feat: specify compatibility with swift 5 (#5)

Co-authored-by: xiaoweii <xiaoweii@amazom.com>

Author: zhu-xiaowei

clickstream-react-native.podspec

@@ -4,17 +4,18 @@ package = JSON.parse(File.read(File.join(__dir__, "package.json")))
 folly_compiler_flags = '-DFOLLY_NO_CONFIG -DFOLLY_MOBILE=1 -DFOLLY_USE_LIBCPP=1 -Wno-comma -Wno-shorten-64-to-32'
 
 Pod::Spec.new do |s|
-  s.name         = "clickstream-react-native"
-  s.version      = package["version"]
-  s.summary      = package["description"]
-  s.homepage     = package["homepage"]
-  s.license      = package["license"]
-  s.authors      = package["author"]
+  s.name          = "clickstream-react-native"
+  s.version       = package["version"]
+  s.summary       = package["description"]
+  s.homepage      = package["homepage"]
+  s.license       = package["license"]
+  s.authors       = package["author"]
 
-  s.platforms    = { :ios => "13.0"}
-  s.source       = { :git => "https://github.com/awslabs/clickstream-react-native.git", :tag => "#{s.version}" }
+  s.platforms     = { :ios => "13.0"}
+  s.swift_version = '5.7'
+  s.source        = { :git => "https://github.com/awslabs/clickstream-react-native.git", :tag => "#{s.version}" }
 
-  s.source_files = "ios/*.{h,m,mm,swift}"
+  s.source_files  = "ios/*.{h,m,mm,swift}"
 
   s.subspec 'Clickstream' do |sc|
     sc.source_files = 'ios/Clickstream/Sources/**/*'