docs: fix typo in readme

closes #467

README.md

@@ -346,7 +346,7 @@ call `req.setEncoding` when using this module. The `status` property is set to
 
 This error will occur when the request is no longer readable when this middleware
 attempts to read it. This typically means something other than a middleware from
-this module read the reqest body already and the middleware was also configured to
+this module read the request body already and the middleware was also configured to
 read the same request. The `status` property is set to `500` and the `type`
 property is set to `'stream.not.readable'`.