Fix typo (#385)

Author: tu4mo

README.md

@@ -1068,7 +1068,7 @@ This allows you to check whether the given element has an
 
 Use the `aria-errormessage` attribute to reference another element that contains
 custom error message text. Multiple ids is **NOT** allowed. Authors MUST use
-`aria-invalid` in conjunction with `aria-errormessage`. Leran more from
+`aria-invalid` in conjunction with `aria-errormessage`. Learn more from
 [`aria-errormessage` spec](https://www.w3.org/TR/wai-aria/#aria-errormessage).
 
 Whitespace is normalized.