Prepare 4.0.0 release

Author: johnkary

CHANGELOG.md

@@ -4,11 +4,9 @@ CHANGELOG
 View diff for a specific commit:  
 https://github.com/johnkary/phpunit-speedtrap/commit/XXX where XXX is the commit hash
 
-View diff between two versions:  
-https://github.com/johnkary/phpunit-speedtrap/compare/v3.3.0...v4.0.0
-
-## 4.0 (xxxx-xx-xx)
+## 4.0.0 (2021-05-03)
 
+* Changelog ([`v3.3.0...v.4.0.0`](https://github.com/johnkary/phpunit-speedtrap/compare/v3.3.0...v4.0.0))
 * [PR #82](https://github.com/johnkary/phpunit-speedtrap/pull/82) New option `stopOnSlow` stops execution upon first slow test. Default: false.
 * [PR #84](https://github.com/johnkary/phpunit-speedtrap/pull/84) New annotation option `@slowThreshold 0` disables checks for individual tests.