Merge pull request #17 from yesmeck/use-var

Use var instead of let

Author: bvaughn

index.js

@@ -61,9 +61,9 @@ export function polyfill(Component) {
   // If new component APIs are defined, "unsafe" lifecycles won't be called.
   // Error if any of these lifecycles are present,
   // Because they would work differently between older and newer (16.3+) versions of React.
-  let foundWillMountName = null;
-  let foundWillReceivePropsName = null;
-  let foundWillUpdateName = null;
+  var foundWillMountName = null;
+  var foundWillReceivePropsName = null;
+  var foundWillUpdateName = null;
   if (typeof prototype.componentWillMount === 'function') {
     foundWillMountName = 'componentWillMount';
   } else if (typeof prototype.UNSAFE_componentWillMount === 'function') {