Fix podspec

Author: 3lvis

.swift-version

@@ -12,5 +12,5 @@ Pod::Spec.new do |s|
   s.source_files = 'Source/**/*'
   s.resource_bundles = { 'ImagePicker' => ['Images/*.{png}'] }
   s.frameworks = 'AVFoundation'
-  s.pod_target_xcconfig = { 'SWIFT_VERSION' => '5.0' }
+  s.swift_version = '5.0'
 end