added changelog

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+## [Unreleased]
+### Added
+- Viewer overlay: minimap (optional)
+
+### Changed
+- Viewer: use subsampling and tiling to display large images
+
+### Fixed
+- Fixed finding dimensions of entries with incorrect EXIF
+
+## [v1.2.5] - 2020-11-01
+### Added
+- Search: show recently used filters (optional)
+- Search: show filter for entries with no XMP tags
+- Search: show filter for entries with no location information
+- Analytics: use Firebase Analytics (along Firebase Crashlytics)
+
+### Changed
+- Upgraded Flutter to stable v1.22.3
+- Viewer overlay: showing shooting details is now optional
+
+### Fixed
+- Viewer: leave when the loaded entry is deleted and it is the last one
+- Viewer: refresh the viewer overlay and info page when the loaded image is modified
+- Info: prevent reporting a "Media" section for images other than HEIC/HEIF
+- Fixed opening entries shared via a "file" media content URI
+
+### Removed
+- Dependencies: removed Guava as a direct dependency in Android
+
+## [v1.2.4] - 2020-11-01 [YANKED]
+
+## [v1.2.3] - 2020-10-22
+...