Merge pull request #17 from kakaopensource/more-appropriate-way-for-pattern

replace symbol '~=' with pattern keyword

Author: CoderMJLee

KakaJSON/Extension/Dictionary+KJ.swift

@@ -89,7 +89,7 @@ extension Dictionary where Key == String {
                 if value == nil { return nil }
             } else if let array = value as? [Any] {
                 guard let index = Int(subKey),
-                    array.indices ~= index else { return nil }
+                    case array.indices = index else { return nil }
                 value = array[index]
             }
         }