Readme PostgreSQL

https://github.com/FreshRSS/FreshRSS/issues/416

CHANGELOG.md

@@ -5,7 +5,7 @@
 * API
 	* Support for editing feeds and categories from client applications [#1254](https://github.com/FreshRSS/FreshRSS/issues/1254)
 * Compatibility:
-	* Experimental support for PostgreSQL [#1195](https://github.com/FreshRSS/FreshRSS/pull/1195)
+	* Support for PostgreSQL [#416](https://github.com/FreshRSS/FreshRSS/issues/416)
 	* New client supporting FreshRSS on Linux: FeedReader 2.0+ [#1252](https://github.com/FreshRSS/FreshRSS/issues/1252)
 * Features
 	* Rework the “mark as read during scroll” option, enabled by default for new users [#1258](https://github.com/FreshRSS/FreshRSS/issues/1258), [#1309](https://github.com/FreshRSS/FreshRSS/pull/1309)
@@ -36,6 +36,7 @@
 	* Allow extensions for default account in anonymous mode [#1288](https://github.com/FreshRSS/FreshRSS/pull/1288)
 	* Trigger a `freshrss:load-more` JavaScript event to help extensions [#1278](https://github.com/FreshRSS/FreshRSS/issues/1278)
 * SQL
+	* Slightly modified several SQL requests (MySQL, SQLite) to simplify support of PostgreSQL [#1195](https://github.com/FreshRSS/FreshRSS/pull/1195)
 	* Increase performances by removing a superfluous category request [#1316](https://github.com/FreshRSS/FreshRSS/pull/1316)
 * Mics.
 	* Removed *resource-priorities* attributes (`defer`, `lazyload`), deprecated by W3C [#1222](https://github.com/FreshRSS/FreshRSS/pull/1222)