Py7zr

Added
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* test: unit tests for Sparc, ARMT and IA64 filters.

Changed
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* Documents: additional methods, filter examples.
* CI configurations: Manage coverage with Coveralls.

Changed
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* Refactoring decompression classes to handle data precisely with folder.unpacksizes(146)

Added
--------

Support for PPC and ARM filters.

Added
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* Support encryption(145)
* Export supported filter constants, such as FILTER_ZSTD(145)

Changed
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* Default compression mode is LZMA2+BCJ which is as same as
7zip and p7zip(145)
* Enhance encryption strength, IV is now 16 bytes, and generated
with cryptodom.random module.(145)


Fixed
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* Support combination of filters(145)
* Compression of Delta, BZip2, ZStandard, and Deflate(145)

Fixed
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* Extraction fails on python 3.5.(151)

Added
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* Support for encrypted header (139, 140)

Changed
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* Fix CRC32 check and introduce test and testzip methods (138)

Fixed
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* Allow decryption of data which is encrypted without any compression.(140)