Updated the podspec

Author: vigneshuvi

SwiftCSVExport.podspec

@@ -69,7 +69,7 @@ Pod::Spec.new do |s|
   #  When using multiple platforms
   s.ios.deployment_target = "8.0"
   s.osx.deployment_target = "10.9"
-  s.swift_version = '4.2'
+  s.swift_version = '5.0'
   # s.watchos.deployment_target = "2.0"
   # s.tvos.deployment_target = "9.0"