• Removed support for .net2.0 and .netstandard1.3
• Added support for .net6.0
• For core version ReadOnlySpan versions was added
• Optimized CRC32 version for .net6.0
• Intrinsic for CRC32C version for .net6.0

This release included .net standard 2.0 support. There are nothing special about it, but for correct dependencies it should exists.
Also, in this release two methods were added ComputeAndWriteToEnd/IsValidWithCrcAtEnd to utilize Crc property about calculating crc(data + crc_value). See documentation page for details.

Additional improvements in algorithm with +70MB/s calculation speed as result.
Added Crc32C implementation (due lack of other .NET core implementations).
Added option to constructor with ability to specify BigEndian/LittleEndian byte conversion for HashFinal.

Initial release of Crc32. It seems, it would be last release, because implementation is fully completed. But if I find some ways to improve speed, I'll add additional release.