Moved Spanish translation to completed section.

README.md

@@ -15,6 +15,7 @@ Translations:
     - [Tiếng Việt - Vietnamese](translations/README-vi.md)
     - [Español](translations/README-es.md)
 
+
 Translations in progress:
     - [हिन्दी](https://github.com/jwasham/coding-interview-university/issues/81)
     - [עברית](https://github.com/jwasham/coding-interview-university/issues/82)