Updated changelog

Author: Progi1984

docs/changes/0.2.0.md

@@ -10,4 +10,5 @@
 
 ## Miscellaneous
 
-- Github Action : Roave BC Check by [@Progi1984](https://github/Progi1984) in [#9](https://github.com/PHPOffice/Math/pull/9)
+- Github Action : Roave BC Check by [@Progi1984](https://github/Progi1984) in [#9](https://github.com/PHPOffice/Math/pull/9)
+- Bump actions/setup-python from 2 to 4 by [@dependabot](https://github/dependabot) in [#11](https://github.com/PHPOffice/Math/pull/11)