doc: create 0.1.20 changelog

Author: Gerold103

changelogs/0.1.20.md

@@ -0,0 +1,37 @@
+Date: 23-05-2022
+
+Tag: 0.1.20
+
+## Compatibility
+
+VShard 0.1.20 is fully compatible with the previous VShard versions. But since
+this release VShard supports only Tarantool >= 1.10.1.
+
+## Functionality added or changed
+
+* The configuration option `collect_lua_garbage` is deprecated. Now it doesn't
+  do anything except printing a warning in the logs that it should not be used.
+
+* The router now supports `msgpack.object` feature. It can be passed to all
+  `vshard.router.call...()` and `.map_call...()` functions. They can also accept
+  the netbox option `return_raw` to get an msgpack object in return (gh-312).
+
+* The URIs in the config now support everything what can be passed to
+  `box.cfg.listen` and `netbox.connect()`: number, string, table. There is also
+  a new config option - `<replica_object>.listen`. It can be used to setup
+  listen on multiple ports on storages and for SSL in Tarantool Enterprise
+  (gh-325).
+
+## Bugs fixed
+
+* Fixed a bug when router could raise a Lua exception about `vshard.error` being
+  not defined if a storage was disabled (implicitly or via
+  `vshard.storage.disable()`).
+
+* Fixed a bug when router could raise a Lua exception about `master_uuid`
+  variable being not defined when `master='auto'` feature was used.
+
+* Fixed a bug when usage of `memtx_use_mvcc_engine` option in `box.cfg` could
+  make bucket garbage collector not work. As a result, rebalancing also could
+  stop working and there could be `'garbage'` and `'sent'` buckets visible in
+  the monitoring (gh-314).