miurahr/py7zr: Support "Append" mode

Changes from v0.9.2

• Fix BCJ(x86) filter code with a missing logic which cause extraction error for certain data. (#249, #250)
• Raise PasswordRequired when encrypted header without passing password (#234, #237)
• CLI: don't raise exception when password is wrong or not given.(#229)
• Fix specification typo.
• Catch exception in threading extraction(#218,#219)

• Compatibility test with python-libarchive-c/libarchive for compression(#247)
• Document: express how to handle multi-volume archive (#243)
• SevenZipFile.needs_password() method.(#208, #235)
• CLI: Support append mode command line.(#228)
• Support "APPEND" mode. User can open SevenZipFile() class with mode='a' (#227)

• Calculate CRC32 of header without re-reading header from disk again.(#245)
• read(), extract(): improve performance when specifying parts of archived file, by skipping rest of arcvhive when target file has extracted.(#239,#242)
• read(), extract(): improve performance when specifying parts of archived file, by not running threads for unused compression blocks(folders).(#239,#242)
• docs: improve API documentation.(#244)
• setup: set minimum required python version as >=3.5
• Compression will be happened when call write() not close() (#222, #226)
• Handle file read/write in SevenZipCompressor/Decompressor class (#213)