Change logs for tomoyo-tools source package in Groovy

tomoyo-tools (2.6.0-20190305-1) unstable; urgency=medium

  * New upstream release 
  * debian/control
    - set Standards-Version: 4.3.0
    - use dh12
    - add Rules-Requires-Root: no
  * debian/copyright
    - update copyright year
  * drop unnecessary debian/upstream/signing-key.pgp, we have .asc file

  [ Ondřej Nový ]
  * d/changelog: Remove trailing whitespaces

 -- Hideki Yamane <email address hidden>  Sat, 09 Mar 2019 19:48:43 +0900