Update KeychainSwift.podspec

KeychainSwift.podspec

@@ -17,7 +17,7 @@ Pod::Spec.new do |s|
   s.source_files = "Sources/*.swift"
   s.ios.deployment_target = "8.0"
   s.osx.deployment_target = "10.10"
-  s.watchos.deployment_target = "2.0"
+  s.watchos.deployment_target = "3.0"
   s.tvos.deployment_target = "9.0"
   s.swift_version = "4.2"
 end