Change logs for mecab source package in Disco

mecab (0.996-6) unstable; urgency=medium

  * debian/control
    - update Maintainer field 
    - set Standards-Version: 4.1.4
  * debian/copyright
    - update copyright year

 -- Hideki Yamane <email address hidden>  Sun, 20 May 2018 12:38:17 +0900