Specify Postmon zip codes for Brazil, not globally

README.md

@@ -456,7 +456,7 @@ Please note a passing build status indicates all listed APIs are available since
 
 | API | Description | Auth | HTTPS | Link |
 |---|---|---|---|---|
-| Postmon | An API to query ZIP codes and orders easily, quickly and free | No | No | [Go!](http://postmon.com.br) |
+| Postmon | An API to query Brazilian ZIP codes and orders easily, quickly and free | No | No | [Go!](http://postmon.com.br) |
 | Sweden  | Provides  information about parcels in transport | `apikey` | No | [Go!](https://developer.postnord.com/docs2) |
 
 ### Transportation