v0.4.0

• Add support for Nomad 0.5
• Force monospace font for log tail
• Rework file tailing
• Add more details to Client view
• Reduce precision (milliseconds) from "duration" output

This will actually still work with Nomad 0.4, the only known breakage here is the "servers" endpoint that changed signature in 0.5, and thus broke previous versions of nomad-u i:)