bump up version to 0.6.0.

Author: sgr-ksmt

FireSnapshot.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = "FireSnapshot"
-  s.version          = "0.5.0"
+  s.version          = "0.6.0"
   s.summary          = "Firebase Cloud Firestore Model Framework using Codable."
   s.homepage         = "https://github.com/sgr-ksmt/#{s.name}"
   s.license          = 'MIT'

README.md

@@ -66,7 +66,7 @@ Snapshot.get(.user(userID: "xxxx")) { result in
 - CocoaPods
 
 ```ruby
-pod 'FireSnapshot', '~> 0.5.0'
+pod 'FireSnapshot', '~> 0.6.0'
 ```
 
 ## Dependencies