Fixup for mix.exs metadata

Signed-off-by: Thomas Citharel <tcit@tcit.fr>
4 jobs for master in 2 minutes and 45 seconds (queued for 1 second)
Status Name Job ID Coverage
  Check
passed check #583834

00:00:51

 
  Test
passed mix #583835

00:01:05

 
  Deploy
passed pages #583836

00:00:48

passed pages:deploy

00:00:00