Add CHANGELOG.md

CHANGELOG.md

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+## 0.3.0-pre
+
+### Breaking Changes
+
+- Line width is now measured in pixels. (earlier, pt = 4/3 px)
+
+### Features
+
+- Add per-channel amplification support
+- Add color picker to GUI
+
+### Changelog
+- ...
+
+## 0.2.0 and before
+
+See https://github.com/nyanpasu64/corrscope/releases.