Prevents updating to LiveView 1.0

[nathanl]

mix deps.get
Resolving Hex dependencies...
Resolution completed in 0.592s
Because every version of plox depends on phoenix_live_view ~> 0.20 and your app depends on phoenix_live_view ~> 1.0, no version of plox is allowed.
So, because your app depends on plox, version solving failed.
** (Mix) Hex dependency resolution failed

[doughsay]

Closed in #16