added changelog

CHANGELOG.md

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+# RetroFW Changelog
+
+The next list is all the changes registered on the **custom firmware** version updates.
+
+## 1.2 _(Mar 02, 2019)_
+- Fix boot lag due to bad behaved FAT32 partition in some uSD Cards
+
+## 1.1 _(Feb 24, 2019)_
+- Rebuilt rootfs based on buildroot-2018.02.11
+- Add OGG support
+- exFAT support (experimental)
+- Add Python + PyGame libraries
+- Improved recovery mode
+  - Improved automatic SD card resizing
+  - Added file system check mode
+- Fix power off bug in Kernel