Prepare 1.3 release (#254)

* Update changelog for 1.3.
* Update lib parson to the current version.
* Update our upgrade script from 1.2 to 1.3 with all the changes.
* Adapt to a new replication slot name on upgrade from 1.2 to 1.3.
* Improve error message when failed to update keeper state.
* We might still have to clean-up postgresql.auto.conf.

Co-authored-by: Jelte Fennema <github-tech@jeltef.nl>

CHANGELOG.md

@@ -1,3 +1,14 @@
+### pg_auto_failover v1.3 (April 30, 2020) ###
+
+* Fix systemd integration [#212]
+* Change default TLS cipher list [#214]
+* SSL certificates management fixes [#228]
+* Improve replication slots handling [#222]
+* Implement pg_autoctl enable|disable ssl [#233]
+* Implement pg_autoctl show uri --monitor [#238]
+* Implement pg_autoctl stop|reload for the monitor [#241]
+* Don't create pgautofailover_monitor user anymore [#247]
+
 ### pg_auto_failover v1.2 (March 17, 2020) ###
 
 * Feature implement an option (--skip-pg-hba) to skip editing of HBA rules by pg_autoctl (#169)

src/bin/lib/parson/LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2012 - 2019 Krzysztof Gabis
+Copyright (c) 2012 - 2020 Krzysztof Gabis
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal