Version 0.7

Changes

• add snappy (https://github.com/andikleen/snappy-c)
• update versions: zstd 1.4.5, lz4 1.9.2
• add github workflow actions

Included compressor types and version numbers:

• brotli-mt, based on brotli v1.0.7
• lizard-mt, based on lizard v2.0
• lz4-mt, based on lz4 v1.9.2
• lz5-mt, based on lz5 v1.5
• snappy-mt, based on snappy-c
• zstd-mt, based on zstd 1.4.5

Windows binaries:
The zip file zstdmt-win.zip contains windows binaries, compiled for win32 and win64 targets.
Compiler used: mingw gcc-Version 8.1.0 (GCC)