Change logs for pngtools source package in Hirsute

pngtools (0.4-1.3) unstable; urgency=medium

  * Non-maintainer upload.
  * Switch to autoreconf (Closes: #822547)
  * Bump compat level to 9
  * Drop cdbs
  * Refactor rules file, fixing a build failure
    with as-needed flags.
  * Patch configure.in following png rename of
    api.

 -- Gianfranco Costamagna <email address hidden>  Sun, 24 Apr 2016 22:47:36 +0200