bump version to for json-enum to 1.2.4

jsonlogic.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name = "jsonlogic"
-  s.version = "1.2.3"
+  s.version = "1.2.4"
   s.summary = "A JsonLogic Swift library"
   s.description = "A JsonLogic implementation in Swift. JsonLogic is a way to write rules that involve computations in JSON format, these can be applied on JSON data with consistent results. So you can share between server and clients rules in a common format."
   s.homepage = "https://github.com/advantagefse/json-logic-swift"