Release 0.1.2

Changes:

• #8 Support different kinds of queues through a trait
• #9 Remove bounded and impl Default from Queue trait
• #10 Use queue type for state API
• #11 Make State::len take immutable reference

Release 0.1.1

This release introduces minor fixes:

• Use HashMap instead of Vec for storing components.
• Fix the example in the documentation and add one to examles
• Introduce initial CI workflow.

Release 0.1.0

Initial release