Clarify deprecated versions

README.md

@@ -78,16 +78,16 @@ Please refer to the [e2e.spec.ts](spec/e2e.spec.ts) for more details on the usag
 -   A re-release of 4.0.1 since that version broke the CommonJS API.
 -   Remove an internal type from the public API.
 
-### 4.0.1
+### 4.0.1 (deprecated)
 
--   _Accidentally broke CommonJS API in 4.0.1. Re-released as 5.0.0._
+-   _Deprecated, since the CommonJS API was accidentally changed in 4.0.1. Re-released as 5.0.0._
 -   Re-introduce CommonJS support, while keeping the ES module support. Thanks to [Harel Mazor](https://github.com/HarelM) and [Simeon Cheeseman](https://github.com/SimeonC).
 -   Export all public types from `index.d.ts`. Thanks to [Harel Mazor](https://github.com/HarelM) and [Simeon Cheeseman](https://github.com/SimeonC).
 -   Full typing support for TypeScript. Thanks to [Harel Mazor](https://github.com/HarelM).
 
-### 4.0.0
+### 4.0.0 (deprecated)
 
--   _Accidentally dropped CommonJS support. This is fixed again in 4.0.1._
+-   _Deprecated, since the CommonJS support was accidentally dropped. This is fixed again in 4.0.1._
 -   Dropped support for node.js 14, 12, 10 and 8.
 -   Full typing support for TypeScript. Thanks to [Harel Mazor](https://github.com/HarelM).