Update styleguide.md

Author: basarat

docs/styleguide/styleguide.md

@@ -249,7 +249,7 @@ const foo: string = "hello";
 
 * Use semicolons.
 
-> Reasons: Explicit semicolons helps language formatting tools give consistent results. Missing ASI (automatic semicolon insertion) can trip new devs e.g. `foo() \n (function(){})` will be a single statement (not two). Recommended by TC39 as well.
+> Reasons: Explicit semicolons helps language formatting tools give consistent results. Missing ASI (automatic semicolon insertion) can trip new devs e.g. `foo() \n (function(){})` will be a single statement (not two). TC39 [warning on this as well](https://github.com/tc39/ecma262/pull/1062). Example teams: [airbnb](https://github.com/airbnb/javascript), [idiomatic](https://github.com/rwaldron/idiomatic.js), [google/angular](https://github.com/angular/angular/), [facebook/react](https://github.com/facebook/react), [Microsoft/TypeScript](https://github.com/Microsoft/TypeScript/).
 
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