Note Briefly v0.4+ requires Elixir v1.11+.

• Add :monitor_pid option to Briefly.create/1 (#19) @scarfacedeb
• Avoid folder naming conflicts with monotonic time and random padding (#18) @zph
• Add Briefly.cleanup/0 (#10) @gmalkas
• Fix an issue where the sub directory is not created correctly (#9) @Schultzer
• Fix error reasons to conform to posix error codes (#4) @ngeraedts
• Numerous updates for CI / language changes (h/t @bryanstearns @k-cross @szajbus @devstopfix @sgerrand @mad42 @warmwaffles)