Remove reference to SwiftLint Void rule

README.md

@@ -2267,7 +2267,7 @@ _You can enable the following settings in Xcode by running [this script](resourc
 
 ### Closures
 
-* <a id='favor-void-closure-return'></a>(<a href='#favor-void-closure-return'>link</a>) **Favor `Void` return types over `()` in closure declarations.** If you must specify a `Void` return type in a function declaration, use `Void` rather than `()` to improve readability. [![SwiftLint: void_return](https://img.shields.io/badge/SwiftLint-void__return-007A87.svg)](https://realm.github.io/SwiftLint/void_return)
+* <a id='favor-void-closure-return'></a>(<a href='#favor-void-closure-return'>link</a>) **Favor `Void` return types over `()` in closure declarations.** If you must specify a `Void` return type in a function declaration, use `Void` rather than `()` to improve readability.
 
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