v0.3.0

Features

• Added Watchable::has_watchers(&self) -> bool
• Added Watcher::is_connected(&self) -> bool

Breaking Changes

• Watcher::get now takes &mut self instead of &self and returns Self::Value instead of Result<Self::Value, Disconnected>.
  It will now update the watcher to the latest value internally, so a call to Watcher::get in between two Watcher::poll_updated calls will potentially have an effect it didn't have before.
  It now also returns the last known state intsead of potentially returning disconnected.
  If you want to know about the disconnected state, use Watcher::is_connected.
• InitializedFut now implements Future<Output = T> instead of Future<Output = Result<T, Disconnected>>.
  Should the underlying watchable disconnect, the future will now be pending forever.