doc: create 0.1.22 changelog

A new 0.1.22 release

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changelogs/0.1.22.md

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+Date: 20-02-2023
+
+Tag: 0.1.22
+
+## Compatibility
+
+VShard 0.1.22 is fully compatible with the previous VShard versions.
+
+## Functionality added or changed
+
+* A new trigger `vshard.storage.on_bucket_event()` to react on bucket events,
+  such as move or GC (gh-372).
+
+* `vshard.router/storage.info()` now accept an option `{with_services = true}`
+  to get additional info about background services (such as discovery or
+  rebalancer) that are working on the current instance (gh-107).
+
+## Bugs fixed
+
+* Fixed a bug that the rebalancing could lead to inconsistency in buckets. In
+  scope of the same bugfix all the updates in `_bucket` space are now severely
+  restricted and validated (gh-377, gh-173).
+
+* `vshard.router/storage.cfg{}` now can not be called from multiple fibers at
+  the same time (gh-140).
+
+* Fixed a bug that certain router error objects didn't have `router_name` field.