Add a changelog

CHANGELOG.md

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+# Changelog
+
+## 1.3.0
+
+- Added `concurrent` config option.
+- Changed Haskell image.
+
+## 1.2.0
+
+- Added `prefix` and `codePrefix` config options.
+- Enhanced help command to show enabled languages.
+- Sped up Haskell module evaluation.
+- Disabled memory swap.
+- Fixed folder conflicts when multiple evals done in sucession.
+- Fixed reload command.
+
+## 1.1.0
+
+- Added `prepare` config option.
+- Made containers stay up for the whole time instead of per eval.
+
+## 1.0.0
+
+- Initial release.