Update to 4.004

4.004 Sun Nov 12

• Fix build issues from C++ style comments
• Fixup build_requires

4.003 Sun Nov 12

• Fixup Devel::CheckLib usage
• Do not compress using Snappy if the buffer is larger 2**32
• Build fixes

4.001_001 Mon Feb 6 11:13:40 CEST 2017

• Sereal v4 release with Zstandard compression support https://github.com/facebook/zstd