Import Debian changes 0.5.2-1

hfst-ospell (0.5.2-1) unstable; urgency=low

  [ Tino Didriksen ]
  * Update to latest upstream
  * Fixes build with GCC 10 (closes: #957334)
  * Incorporates ICU patch
  * debian/control:
    + Binary update: libhfstospell10 -> libhfstospell11
    + Updated Standards-Version to 4.5.0
  [ Kartik Mistry ]
  * Added debian/gitlab-ci.yml