updated the changelog to have links to tag comparison in github

verified how mix docs handles it, all good 👌

Author: Shakadak

CHANGELOG.md

@@ -1,55 +1,65 @@
-## Changelog
+# Changelog
 
-## 0.6.6
+## [Unreleased]
+
+### Changed
+
+* Improvement on the doc
+
+## [0.6.6] (2019-02-24)
 
 * small bugfix: Fix compilation warnings on newer versions of Elixir
 * doc updates
 
 
-## 0.6.5 (2017-02-08)
+## [0.6.5] (2017-02-08)
 
 * small bugfix : unexpected `:halted` of enumerable
 
-## 0.6.4 (2017-01-17)
+## [0.6.4] (2017-01-17)
 
 * make it compatible with Elixir 1.4
 
-## 0.6.3 (2016-12-14)
+## [0.6.3] (2016-12-14)
 
 * bugfix: xpath `optional` with cast and void should return nil
 * add "soft" uppercase cast modifier : put default value if type
   modifier is uppercase "",0,0.0
 * if "soft" and "optional", then return nil with value not compatible
 
-## 0.6.1 (2016-02-10)
+## [0.6.1] (2016-02-10)
 
 * bugfix: xpath `list` modifier should always return a list
 
-## 0.6.0 (2016-02-09)
+## [0.6.0] (2016-02-09)
 
 * text() XML nodes are now joined with the `s` modifier
 * `transform_by` function allows you to customize each mapped field
   with any function
 
-## 0.5.0 (2015-10-28)
+## [0.5.1] (2016-02-08)
+
+## [0.5.0] (2015-10-28)
 
 * Added support to optional modifier
 * Update Elixir requirement
 * Map refactoring, from if/else tree to cleaner pattern matching
 * Add casting capabilities
 * Fix dependencies : doc deps only for `:dev` and OTP `:xmerl` dependency
 
-## 0.4.0 (2015-09-11)
+## [0.4.0] (2015-09-11)
 
 * Added support to map into keyword list instead of maps
 
-## 0.3.0 (2015-08-10)
+## [0.3.0] (2015-08-10)
 
 * Added support to return values as strings (viniciussbs)
 
 * Fix stream `:halt` handling (awetzel)
 
-## 0.2.0 (2016-04-11)
+## [0.2.1] (2016-04-12)
+
+## [0.2.0] (2016-04-11)
 
 * Fixed encoding issue and improved speed (awetzel)
 
@@ -58,3 +68,21 @@
 * Added element streaming (awetzel)
 
 * Added support for scalar values (xbrukner)
+
+## [0.1.1]
+
+[unreleased]: https://github.com/kbrw/sweet_xml/compare/0.6.6...HEAD
+[0.6.6]: https://github.com/kbrw/sweet_xml/compare/0.6.5...0.6.6
+[0.6.5]: https://github.com/kbrw/sweet_xml/compare/0.6.4...0.6.5
+[0.6.4]: https://github.com/kbrw/sweet_xml/compare/0.6.3...0.6.4
+[0.6.3]: https://github.com/kbrw/sweet_xml/compare/0.6.2...0.6.3
+[0.6.2]: https://github.com/kbrw/sweet_xml/compare/0.6.1...0.6.2
+[0.6.1]: https://github.com/kbrw/sweet_xml/compare/0.6.0...0.6.1
+[0.6.0]: https://github.com/kbrw/sweet_xml/compare/0.5.1...0.6.0
+[0.5.1]: https://github.com/kbrw/sweet_xml/compare/0.5.0...0.5.1
+[0.5.0]: https://github.com/kbrw/sweet_xml/compare/0.4.0...0.5.0
+[0.4.0]: https://github.com/kbrw/sweet_xml/compare/0.3.0...0.4.0
+[0.3.0]: https://github.com/kbrw/sweet_xml/compare/0.2.1...0.3.0
+[0.2.1]: https://github.com/kbrw/sweet_xml/compare/0.2.0...0.2.1
+[0.2.0]: https://github.com/kbrw/sweet_xml/compare/0.1.1...0.2.0
+[0.1.1]: https://github.com/kbrw/sweet_xml/compare/f203bdf...0.1.1