Update pspdfkit_flutter.podspec

Author: RadAzzouz

ios/pspdfkit_flutter.podspec

@@ -16,7 +16,7 @@ PSPDFKit flutter plugin.
   s.public_header_files = 'Classes/**/*.h'
   s.dependency 'Flutter'
   s.dependency 'PSPDFKit'
-  s.swift_version = '4.2'
-  s.ios.deployment_target = '10.0'
+  s.swift_version = '5.0'
+  s.ios.deployment_target = '11.0'
 end