v1.7.5
updated README.md
lz4 version source from lz4.h
added a few dates
changed default PREFIX and MANDIR
fix #283 : implement LZ4_versionString().
fixed minor display error when using -r
updated a few macros names
LZ4F_compressBound(0) provides upper bound for LZ4F_flush() and LZ4F_compressEnd() [#290, suggested by @vtermanis]
removed nextToUpdateBT
updated xxhash lib