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Changelog for Etcd::lock

0.03 2022-02-17T15:00:00
    - Add TTL to set after how many seconds a lock is automatically removed.
    - Update documentation.

0.02 2022-02-14T16:22:00
    - Now test using etcd server only is env TEST_ETCD is set.

0.01 2022-02-14T12:25:00
    - First Release.