add changelog for v1.1

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [1.1.0](https://github.com/mataroa-blog/mataroa/compare/v1.0...v1.1) - 2023-09-06
+
+### Important changes
+
+* Rewrite moderation dashboard
+* Rewrite Stripe integration with latest APIs
+* Create new signup workflow
+* Lower image size limit to 1MB
+* Upgrade to Django 5.0
+
+## [1.0.0] - 2023-09-06
+
+This is an initial numbered release after 3+ years of active development.
+
+* Core blogging functionalities
+* Export functionalities
+* Email newsletter
+* Custom domains
+* Backend-based analytics
+* API