v0.1.2

• Added assertions methods to DropTracker (assert_alive(),
  assert_dropped(), etc) to make test code more concise.

• Added fully_alive() and fully_dropped() to DropTracker to quickly check
  if all the tracked keys are in a the desired state.

• DropItem now implements traits to compare its keys with primitive types
  (i32, char, bool, str, ...).

Crate: https://crates.io/crates/drop-tracker/0.1.2
Documentation: https://docs.rs/drop-tracker/0.1.2/drop_tracker/index.html