Add CHANGELOG.md

Author: john-sandall

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+<!-- TOWNCRIER -->
+
+## [1.1.0] - 2022-07-10
+
+- Various upgrades ([#40](https://github.com/HumbleData/beginners-data-workshop/pull/40))
+- **Behind-the-scenes**
+  - Upgrade Python to 3.9.13
+  - Upgrade all dependencies to latest with NumPy/pandas/Matplotlib/scikit-learn matching CoCalc versions.
+  - Switch from `pip-tools` to Poetry (configuration in `pyproject.toml`)
+  - Update Development Setup guidance in `README.md`
+  - Integrate & configure flake8, pylint, black & other linters.
+  - Added pre-commit configuration.
+  - Updated VS Code `settings.json`
+  - Added `linestripper.py` to keep EOF newlines out of solutions code (better attendee UX) yet black-compliant.
+  - Added `CHANGELOG.md` and started versioning releases.
+- **Workshop materials**
+  - Reviewed all workshop materials for deprecations.
+  - Replaced all single quotes in solutions with double quotes for black compliance.
+  - Added EOF newlines to datasets.
+  - Other minor changes: trailing whitespace, trailing commas, isort compliant solution code.
+
+
+## [1.0.0] - 2021-07-23
+Final version used for Humble Data workshops in 2021.