Update CHANGELOG

Author: thejpster

CHANGELOG.md

@@ -9,8 +9,12 @@ The format is based on [Keep a Changelog] and this project adheres to [Semantic
 * `Volume`, `Directory` and `File` are now smart! They hold references to the thing they were made from, and will clean themselves up when dropped. The trade-off is you can can't open multiple volumes, directories or files at the same time.
 * Renamed the old types to `RawVolume`, `RawDirectory` and `RawFile`
 * New method `make_dir_in_dir`
-* Fixed long-standing bug that caused an integer overflow when a FAT32 directory
-  was longer than one cluster ([#74])
+* Fixed long-standing bug that caused an integer overflow when a FAT32 directory was longer than one cluster ([#74])
+* Updated 'shell' example to support `mkdir`, `tree` and relative/absolute paths
+* Renamed `Error::FileNotFound` to `Error::NotFound`
+* New API `change_dir` which changes a directory to point to some child directory (or the parent) without opening a new directory.
+* Empty strings and `"."` convert to `ShortFileName::this_dir()`
+* You can now open directories multiple times without error
 
 [#74]: https://github.com/rust-embedded-community/embedded-sdmmc-rs/issues/74