Ruby 2.4 doesn't allow a blank passphrase

[matthewrudy]

trafficstars

Add a placeholder to avoid this error

[matthewrudy]

For reference, with ruby 2.4.x I use this in my gemfile

gem 'strongbox', github: 'gogovan/strongbox', branch: '2.4.0'

[blimmer]

@spikex can we get this merged? many of us are resorting to the fork.

[matthewrudy]

@blimmer I realise I didn't actually make the test suite pass (and never tried on old versions of Ruby)

So should probably fix that before it's ready to merge to master.