docs(readme): fix typo (#148)

README.md

@@ -326,7 +326,7 @@ if res.Name == "" {
 	// true if `"name"` is either not present or explicitly null
 	res.JSON.Name.IsNull()
 
-	// true if the `"name"` key was not present in the repsonse JSON at all
+	// true if the `"name"` key was not present in the response JSON at all
 	res.JSON.Name.IsMissing()
 
 	// When the API returns data that cannot be coerced to the expected type: