configury: bump release version to 29.
configury: bump release version to 29.

* configure.ac (AC_INIT): Bump release version to 29.
The '5.1.' prefix is a misnomer now tha we support Lua 5.2, and
bumping the prefix to '5.2.' would be no better, since we support
Lua 5.1 simultaneously, and 5.3 will be along one of these days.

Signed-off-by: Gary V. Vaughan <f9023000f29773649f3850298becb9544b5fd6a9@gnu.org>

zevv/luaposix,snegovick/luaposix,rrthomas/luaposix,snegovick/luaposix,jimmyharris/luaposix,luaposix/luaposix,ardje/luaposix,ardje/luaposix,jimmyharris/luaposix,zevv/luaposix,rrthomas/luaposix