Start a changelog and tag 1.2.1

Author: avdata99

CHANGELOG.md

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+# CKAN Hierarchy extension Changelog
+
+## 1.2.1
+
+New features:
+ - Prepare extension for CKAN 2.10 [#61](https://github.com/ckan/ckanext-hierarchy/pull/61)
+Bug Fixes:
+ - Avoid using custom _show_ functions for custom group types.
+   We always use `organization_show` and `group_show` functions now.
+   [#64](https://github.com/ckan/ckanext-hierarchy/pull/64).
+ - Several fixes for custom group types
+
+## 1.2.0
+
+New features:
+ - Add sub groups [#55](https://github.com/ckan/ckanext-hierarchy/pull/55)
+ - Frontend and templates improvements.