Add a long overdue changelog

Changelog.md

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+# Changelog
+
+All notable changes to this project will be documented in this file. The project follows semantic versioning.
+
+## 0.3.0 / 2021-02-19
+
+- [CHANGED] Shapes are now hashable
+- [FIXED] Vector init ambiguity
+- [CHANGED] Use proper XMLElement init
+- [ADDED] `BezierPath`
+- [ADDED] Pi constants
+- [ADDED] `Size` to `NSSize`
+- [ADDED] Boolean operations
+- [ADDED] Ray tracing
+- [ADDED] Shape intersections
+- [ADDED] Perlin noise value for a vector
+
+
+## 0.2.0 / 2020-07-25
+
+- [ADDED] Save SVGs directly to a URL
+- [ADDED] Default alpha in `Color`
+- [ADDED] Piles of documentation
+
+
+## 0.1.0 / 2020-07-25
+
+- [ADDED] Shape primitives
+- [ADDED] SVG drawing
+- [ADDED] CoreGraphics drawing
+- [ADDED] Perlin Noise generator