Merge pull request #2465 from jfsiii/patch-2

Move to exponentiation operator to stage 3

packages/babel/src/transformation/transformers/es7/exponentiation-operator.js

@@ -4,7 +4,7 @@ import build from "../../helpers/build-binary-assignment-operator-transformer";
 import * as t from "../../../types";
 
 export var metadata = {
-  stage: 2
+  stage: 3
 };
 
 var MATH_POW = t.memberExpression(t.identifier("Math"), t.identifier("pow"));