Fix typo in README.md (#648)

README.md

@@ -45,7 +45,7 @@ Project Reunion aims to work on supported versions of Windows.
 Right now we support down to build 17763 (version 1809/October 2018 Update) of Windows 10.
 Wherever possible, we'll use techniques like '_polyfills_' 
 and custom implementations to do the
-heavy lifting for youand make sure your app works across Windows versions and devices.
+heavy lifting for you and make sure your app works across Windows versions and devices.
 In the future, there may be a couple APIs that are dependent on new OS features
 (like new Action Center functionality),
 however we will do our best to ensure