Commit first changelog

CHANGELOG.md

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+# Changelog
+
+## 0.0.3 (2020-08-12)
+
+**Implemented enhancements:**
+
+- New algorithm to search a path between Macrostates in graph
+- Started tracking changes in a changelog :-P
+
+**Fixed bugs:**
+
+**Closed issues:**
+
+**Merged pull requests:**