History
+2018/09/03: Version 6.9.0
+
+2018/08/24: add Unicode Emoji properties
+2018/08/24: update Unicode version 11.0.0
+2018/08/21: support gperf 3.1 instead of 3.0.4
+2018/08/07: add ENABLE_POSIX_API switch into src/Makefile.windows
+2018/08/02: add make_win.bat and src/config.h.windows.in
+2018/06/25: add ENABLE_POSIX_API option into CMakeLists.txt
+2018/06/04: add .travis.yml (for TravisCI)
+
2018/04/17: Version 6.8.2
2018/04/13: add doc/CALLOUTS.API.ja