Changes in version 1.9:

Compression time of option '-0' has been reduced by 3%.

Compression time of options '-1' to '-9' has been reduced by 1%.

Decompression time has been reduced by 3%.

In test mode, minilzip now continues checking the rest of the files if
any input file is a terminal.

The license of the library has been changed to "2-clause BSD".
