Bump src/gnatsd

Bump apcera/gnatsd:
  Derek Collison:
     Merge pull request #19 from apcera/match_iteral_bug ( Travis Success: https://travis-ci.org/apcera/gnatsd/builds/16633946 )
     Move to %q to properly print out ( Travis Unknown )
     Bumped version ( Travis Unknown )
     Fix for MatchLiteral bug, report #18 ( Travis Unknown )