Add changelog entry for poetry & exmaple project changes

Author: ChrisLovering

docs/changelog.rst

@@ -4,6 +4,10 @@
 Changelog
 =========
 
+- :release:`8.3.0 <10th September 2022>`
+- :support:`135` Bump poetry to 1.2.0 in both CI and the example project
+- :bug:`135 major` Add metricity to the example project's docker-compose, so that the site container doesn't crash loop
+
 - :release:`8.2.0 <18th August 2022>`
 - :support:`125` Bump Discord.py to the stable :literal-url:`2.0 release <https://discordpy.readthedocs.io/en/latest/migrating.html>`.