fixed changelog format

Author: Oscar Otero

CHANGELOG.md

@@ -9,10 +9,10 @@ Previous releases are documented in [github releases](https://github.com/oscarot
 
 ## [4.8.0] - 2019-11-04
 ### Changed
-- Many `private` properties and methods were changed to `protected` in order to improve the extensibility #231
+- Many `private` properties and methods were changed to `protected` in order to improve the extensibility [#231]
 
 ### Fixed
-- PHP 7.4 support #230
+- PHP 7.4 support [#230]
 
 ## [4.7.0] - 2019-10-07
 ### Added
@@ -143,8 +143,11 @@ Previous releases are documented in [github releases](https://github.com/oscarot
 [#224]: https://github.com/oscarotero/Gettext/issues/224
 [#225]: https://github.com/oscarotero/Gettext/issues/225
 [#226]: https://github.com/oscarotero/Gettext/issues/226
+[#230]: https://github.com/oscarotero/Gettext/issues/230
+[#231]: https://github.com/oscarotero/Gettext/issues/231
 
-[4.7.0]: https://github.com/oscarotero/Gettext/compare/v4.6.3...HEAD
+[4.8.0]: https://github.com/oscarotero/Gettext/compare/v4.7.0...v4.8.0
+[4.7.0]: https://github.com/oscarotero/Gettext/compare/v4.6.3...v4.7.0
 [4.6.3]: https://github.com/oscarotero/Gettext/compare/v4.6.2...v4.6.3
 [4.6.2]: https://github.com/oscarotero/Gettext/compare/v4.6.1...v4.6.2
 [4.6.1]: https://github.com/oscarotero/Gettext/compare/v4.6.0...v4.6.1