Created Changelog (markdown)

Changelog.md

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+## 0.13.0
+
+Build update
+
+- Updated build process so that `npm run build` now builds the database client as well, saving a few steps
+
+## 0.12.0
+
+For better GDPR compliance
+
+- Removed code using localStorage
+- Implemented rotating salt
+- Added `SameSite` parameter to login cookies
+
+## 0.10.3
+
+- Format long numbers in the UI so they fit on the screen better
+- Responsive CSS updates
+- Various bug fixes
+
+## 0.2.0
+
+- First public release