0.2.0

Changes

1. Update SPIFFS to f5e26c4 (fixes creation of files larger than 24k)
2. By default, don't include the following files/directories: .DS_Store, .git, .gitignore, .gitmodules. New option (-a) is provided to allow these files/directories to be included.
3. Provide two versions of the binaries for each platform: normal one, and the one with "no-magic-length" in its name.
   • Normal version is compatible with the applications which use SPIFFS_USE_MAGIC_LENGTH=1.
   • "no-magic-length" version is compatible with applications which use SPIFFS_USE_MAGIC_LENGTH=0.