Create CHANGELOG.md

Author: Konstiman

CHANGELOG.md

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+# Changelog
+
+## 2021-11-25
+
+### New features
+
+- zooming and selecting papers with browser's back/forward buttons
+- adding a zoomed bubble/selected paper name to the page title
+
+### Changes
+
+- improved hot reloading in webpack
+- urls of local examples have changed
+
+### Removed
+
+- dead tracking code (Google Analytics, our custom endpoint) and related config parameter