v0.60.0 release

• Add changelog

CHANGELOG.md

+## [v0.60.0](https://git.duniter.org/clients/python/duniterpy/-/milestones/3) (26st September 2020)
+
+- #60, !106: Drop Python v3.5 support
+- #86, !106: Scrypt: migrate from `pylibscrypt` to `hashlib.scrypt` from the standard Python 3.6 lib
+- #111, !111: Clearly define the copyright and license statements
+- #68, !106: Package in Debian Bullseye v11
+
+---
+
+- Thanks @vtexier, @Moul
+
 ## [v0.58.0](https://git.duniter.org/clients/python/duniterpy/-/milestones/15) (10st September 2020)
 
 **Note**: This is the last major release with Python v3.5 support.