add ChangeLog for bootloader, move firmware ChangeLog

bootloader/ChangeLog

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+Version 1.3.1
+* Fix button testing so it does not break USB communication
+
+Version 1.3.0
+* Add test for buttons
+* Clean USB descriptor
+* Return firmware_present in Features response
+* Don't halt on broken firware, stay in bootloader
+
+Version 1.2.7
+* Optimize speed of firmware update
+
+Version 1.2.6
+* Show hash of unofficial firmware
+* Use stack protector
+* Clean USB descriptor
+
+Version 1.2.5
+* Initial import of code