mikutter: updated to 3.8.0.

Upstream changes:

mikutter 3.8.0

* create a search tab if at least one search spell is defined
* explicitly specify Addressable 2.5.2 or later
* twitter: warn if User Stream API is used
* update a default message of the status bar for 3.8
* thanks @4pk
* streaming: change file layout since UserStream gone
* remove UserStream settings
* remove UserStream code
* remove unexpected executable bits in some files
* thanks Izumi Tsutsui
* remove unused devel directory

(tsutsui)