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readme.md

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+FatFs - Generic FAT Filesystem Module
+https://elm-chan.org/fsw/ff/
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+`R0.16`
+- Removed a long-pending limitation that f_getcwd and double-dot ".." in the path name did not work on the exFAT volume.
+- Fixed f_readdir cannot detect end of directory and it leads the application process into infinite loop. (appeared at R0.15b)
+- Fixed dot names with terminating separator or duplicated separator are rejected when LFN is not enabled.