Pyncette

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* Fixes bug where a locked dynamic task could be executed again on next tick.
* poll_task is now reentrant with regards to locking. If the lease passed in matches the lease on the task, it behaves as though it were unlocked.

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* Middleware support and optional metrics via Prometheus
* Improved the graceful shutdown behavior
* Task instance and application context are now available in the task context
* Breaking change: dynamic task parameters are now accessed via `context.args['name']` instead of `context.name`
* Improved examples, documentation and packaging

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* Timezone support
* More efficient poling when Redis backend is used

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* First release that actually works.

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* First release on PyPI.