IBus 1.5.29 Beta2 is released

[Takao Fujiwara]

IBus 1.5.29 Beta2 is released.
https://github.com/ibus/ibus/releases/tag/1.5.29-beta2

Now Wayland is enabled by default. You can disable it with
`./configure --disable-wayland` option.

Now I changed the IBus release planning below.
https://github.com/ibus/ibus/wiki/Release-Planning

Probably this beta release is the final for the new features and the
rc1 will be released with the left bug fixes and translation updates
later.