Fix README: "suffix" → "prefix".

Author: rogerluan

README.md

@@ -99,15 +99,15 @@ let request: [String:JSEN] = [
 
 Enters the…
 
-### `%` Suffix Operator
+### `%` Prefix Operator
 
 ```swift
 let request: [String:JSEN] = [
     "amount": %normalizedAmount // This works!
 ]
 ```
 
-The custom `%` suffix operator transforms any `Int`, `Double`, `String`, `Bool`, `[JSEN]` and `[String:JSEN]` values into its respective JSEN value.
+The custom `%` prefix operator transforms any `Int`, `Double`, `String`, `Bool`, `[JSEN]` and `[String:JSEN]` values into its respective JSEN value.
 
 
 By design, no support was added to transform `Optional` into a `.null` to prevent misuse.