Update japanese/lookup to 1.99.96.20180209
* Update to 1.99.96.20130920.
* Switch master site to GitHub.
* Update LICENSE.
* Remove EMACS_FLAVORS_EXCLUDE because this version of Lookup can be built with
editors/emacs-devel.
* Update description and WWW in pkg-descr.
* Add entry to UPDATING about incompatibility.
PR: 225748
Submitted by: yasu@utahime.org (maintainer)