rename tag

Merge pull request #9 from C-Pro/fix/remove-unused-prev

remove unused prev reference

v0.2.3 fix memory leak

Fixes memory leak due to unused reference to previous element.

v0.2.2

Remove couple of unnecessary IFs

v0.2.1 Ignore out of order

Ignore out of order values in AddAt to avoid unexpected behaviour in Expire.

Backfill AddAt function

Add function AddAt that allows to add value at a specified timestamp.
The use case is to backfill data with past values on service restart.
AddAt still should be called in order of timestamps, so the eviction will work as expected.

fix: Evict Last

Fix Last pointer not cleared when all items are evicted from the window.

Initial release

Supports the most basic metrics, no quantiles support yet.