Release note for 1.2.3

doc/release_notes/ProxySQL_v1.2.3.md

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+# ProxySQL v1.2.3
+
+Release date: 2016-09-20
+
+## Performance improvement
+
+None
+
+
+## Usability improvement
+
+* Admin: introduced new table `runtime_mysql_users` [#691](../../../../issues/691)
+* Compile: new packages avaiable for Fedora24
+* Compile: new packages avaiable for Ubuntu16
+* Doc: updated documentation on passwords
+* General: added suppot for systemd (yet not included in binaries)
+
+
+## New features
+
+* Admin: introduced new variable `admin-hash_passwords` to automatically hash mysql passwords [#676](../../../../issues/676)
+* Query Cache: aggressive memory purging when 90% of memory limit is reached [#690](../../../../issues/690)
+* Query Processor: added parsing for several SQL commands
+
+
+## Bug fixes
+
+* Mirroring: fixes several bugs related to errors handling
+* Mirroring: fixes crashing bug
+* Query Cache: memory used was computed incorrectly
+* Connection Pool: a failed `CHANGE_USER` could cause a crash [#682](../../../../issues/682)
+
+
+## Contributors
+
+Thanks to contributors, in alphabetical order:
+* @dveeden