[changelog] Update changelog v0.2.1 (#7)

* Create v0.2.1.md

* Update v0.2.1.md

* Update v0.2.1.md

changelogs/v0.2.1.md

@@ -0,0 +1,5 @@
+## Changelog v0.2.1
+
+* The name of the target file has been changed ([#6](https://github.com/Zhbert/colligendis/pull/6))
+* The location of the final file has been changed ([#6](https://github.com/Zhbert/colligendis/pull/6))
+* Fixed the logic of selecting the latest statistics from the database. ([#8](https://github.com/Zhbert/colligendis/pull/8))