Aiofcm

Changes
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* Added `max_connection_attempts` option to prevent infinitely retrying (https://github.com/Fatal1ty/aiofcm/pull/15) by holyachon
* Added type hints (https://github.com/Fatal1ty/aiofcm/pull/16) by holyachon
* Added CI workflow (https://github.com/Fatal1ty/aiofcm/pull/17) by holyachon

Changes
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* Fixed compatibility with Python 3.10+ https://github.com/Fatal1ty/aiofcm/pull/13

Changes
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* Fix memory leak in connection pool
* Add type hints