Prepare 4.0.0 release

Author: ezzatron

CHANGELOG.md

@@ -1,11 +1,13 @@
 # Phony changelog
 
-## Next release
+## 4.0.0 (2019-12-31)
 
 - **[BC BREAK]** PHP 7.1 is no longer supported.
 - **[NEW]** Added support for specifying ad-hoc mock property types ([#247]).
 - **[IMPROVED]** Improved exporter output for array references ([#244]).
 - **[IMPROVED]** Improved exporter output for weak references ([#245]).
+- **[IMPROVED]** Improved type hints and type declarations for better
+  integration with PHPStan.
 
 [#244]: https://github.com/eloquent/phony/issues/244
 [#245]: https://github.com/eloquent/phony/issues/245

composer.json

@@ -48,7 +48,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "4.0.x-dev"
+            "dev-master": "4.1.x-dev"
         }
     }
 }