Clarify removing polyfills

Author: keithamus

README.md

@@ -42,7 +42,7 @@ Please do not add any polyfills for ECMA features that are Stage 3 or below. We
 
 ### Removing polyfills
 
-When our supported browsers (see github/github for details) all support a feature without polyfills, we can remove the polyfill. This code is designed to be kept lightweight, we do not want to ship dozens of kb of polyfills.
+Polyfills should only be removed after consulting with the `@github/web-systems` who will determine if a polyfill can be removed. This code is designed to be kept lightweight, we do not want to ship dozens of kb of polyfills.
 
 As a polyfill is removed, it may be worth adding feature detection to the `baseSupport` const, to ensure that our baseline moves with our browser support matrix.