Add SpreadElement support to sort-prop-types

Author: yannickcr

lib/rules/sort-prop-types.js

@@ -84,7 +84,7 @@ module.exports = {
       }
 
       declarations.reduce((prev, curr, idx, decls) => {
-        if (/SpreadProperty$/.test(curr.type)) {
+        if (curr.type === 'ExperimentalSpreadProperty' || curr.type === 'SpreadElement') {
           return decls[idx + 1];
         }