Add SpreadElement support to boolean-prop-naming

Author: yannickcr

lib/rules/boolean-prop-naming.js

@@ -68,9 +68,10 @@ module.exports = {
      * @param {Object} node The node we're getting the name of
      */
     function getPropKey(node) {
-      // Check for `ExperimentalSpreadProperty` so we can skip validation of those fields.
-      // Otherwise it will look for `node.value.property` which doesn't exist and breaks Eslint.
-      if (node.type === 'ExperimentalSpreadProperty') {
+      // Check for `ExperimentalSpreadProperty` (ESLint 3/4) and `SpreadElement` (ESLint 5)
+      // so we can skip validation of those fields.
+      // Otherwise it will look for `node.value.property` which doesn't exist and breaks ESLint.
+      if (node.type === 'ExperimentalSpreadProperty' || node.type === 'SpreadElement') {
         return null;
       }
       if (node.value.property) {