added version comparison links to changelog

CHANGELOG.md

@@ -1,42 +1,55 @@
 # Changelog
 
-## 2.2.0 (2017-01-09)
+## [2.2.0] – 2017-01-09
 
 - added support for DateTimeInterface in FormatDateTimeExtension
 - use namespaced template names in ChangeLanguageExtension (available since Twig 1.10) 
 
-## 2.1.1 (2015-12-29)
+[2.2.0]: https://github.com/craue/TwigExtensionsBundle/compare/2.1.1...2.2.0
+
+## [2.1.1] – 2015-12-29
 
 - added support for PHP 7.0 and HHVM
 
-## 2.1.0 (2015-12-01)
+[2.1.1]: https://github.com/craue/TwigExtensionsBundle/compare/2.1.0...2.1.1
+
+## [2.1.0] – 2015-12-01
 
 - added forward compatibility for Twig 2.0
 - added conditional code updates to avoid deprecation notices with Symfony 2.8
 - added support for Symfony 3.*
 - dropped support for Symfony 2.0, 2.1, 2.2
 
-## 2.0.1 (2014-06-01)
+[2.1.0]: https://github.com/craue/TwigExtensionsBundle/compare/2.0.1...2.1.0
+
+## [2.0.1] – 2014-06-01
 
 - updated version constraint for installation instructions
 
-## 2.0.0 (2014-06-01)
+[2.0.1]: https://github.com/craue/TwigExtensionsBundle/compare/2.0.0...2.0.1
+
+## [2.0.0] – 2014-06-01
 
 - BC break (follow `UPGRADE-2.0.md` to upgrade):
   - [#10]: dropped support for passing a `FormView` instance to the `craue_cloneForm` function
 
 [#10]: https://github.com/craue/TwigExtensionsBundle/issues/10
+[2.0.0]: https://github.com/craue/TwigExtensionsBundle/compare/1.0.2...2.0.0
 
-## 1.0.2 (2013-12-03)
+## [1.0.2] – 2013-12-03
 
 - added filter `craue_removeKey`
 
-## 1.0.1 (2013-09-25)
+[1.0.2]: https://github.com/craue/TwigExtensionsBundle/compare/1.0.1...1.0.2
+
+## [1.0.1] – 2013-09-25
 
 - adjusted the Composer requirements to also allow Symfony 2.3 and up (now 2.0 and up)
 - fixed test config
 
-## 1.0.0 (2013-02-28)
+[1.0.1]: https://github.com/craue/TwigExtensionsBundle/compare/1.0.0...1.0.1
+
+## 1.0.0 - 2013-02-28
 
 - first stable release