v1.8.3
updated README.md
lz4 version source from lz4.h
added a few dates
Add support for MidnightBSD
merge lz4opt.h into lz4hc.c
clarify constant MFLIMIT
fixed minor warning in fuzzer.c
Fixed bugs about incorrect acceleration calculation and benchmarking negative compresion level
added comments on version numbers
Integrate lz4frame_static.h Declarations into lz4frame.h
removed one assert() condition
Add `extern "C"` Guards Around Experimental HC Declarations
intel: do not use __attribute__((packed)) on Windows
updated xxhash lib