Update README.md

Just a minor typo on a word.

Author: gustavooferreira

README.md

@@ -25,7 +25,7 @@ The current version of the OpenAPI specification is 2.0 - and you can find it [h
 
 ### [OpenAPI 2.0 Specification](versions/2.0.md)
 
-This repository contains the existing Swagger 1.2, 2.0 specifications as well as proposals for the next verson of the specification, which will be called the OpenAPI Specification 3.0.  The proposals live in the [OpenAPI.next](https://github.com/OAI/OpenAPI-Specification/tree/OpenAPI.next) branch.
+This repository contains the existing Swagger 1.2, 2.0 specifications as well as proposals for the next version of the specification, which will be called the OpenAPI Specification 3.0.  The proposals live in the [OpenAPI.next](https://github.com/OAI/OpenAPI-Specification/tree/OpenAPI.next) branch.
 
 ## Structure