Update DB recommendations (#5793)

* Update DB recommendations
Favour PostgreSQL, based on tests such as:
https://github.com/FreshRSS/FreshRSS/pull/5648#issuecomment-1715843198
https://github.com/FreshRSS/FreshRSS/issues/5707

SQLite is generally very fine, although with the challenge that the DB model cannot easily be updated https://www.sqlite.org/lang_altertable.html#why_alter_table_is_such_a_problem_for_sqlite
(We should ship a command-line update mechanism)

I have verified that FreshRSS still works with `mysql:5.5.62`
https://hub.docker.com/layers/library/mysql/5.5.62/images/sha256-d404d78aa797c87c255e5ae2beb5d8d0e4d095f930b1f20dc208eaa957477b74?context=explore

* sqlite

1 files changed, 4 insertions, 3 deletions

diff --git a/README.md b/README.md
index cfedd8711..f0ce975e3 100644
--- a/README.md
+++ b/README.md
@@ -59,9 +59,10 @@ FreshRSS comes with absolutely no warranty.
 	* It even works on Raspberry Pi 1 with response time under a second (tested with 150 feeds, 22k articles)
 * A web server: Apache2.4+ (recommended), nginx, lighttpd (not tested on others)
 * PHP 7.4+
-	* Required extensions: [cURL](https://www.php.net/curl), [DOM](https://www.php.net/dom), [JSON](https://www.php.net/json), [XML](https://www.php.net/xml), [session](https://www.php.net/session), [ctype](https://www.php.net/ctype), and [PDO_MySQL](https://www.php.net/pdo-mysql) or [PDO_SQLite](https://www.php.net/pdo-sqlite) or [PDO_PGSQL](https://www.php.net/pdo-pgsql)
-	* Recommended extensions: [GMP](https://www.php.net/gmp) (for API access on 32-bit platforms), [IDN](https://www.php.net/intl.idn) (for Internationalized Domain Names), [mbstring](https://www.php.net/mbstring) (for Unicode strings), [iconv](https://www.php.net/iconv) (for charset conversion), [ZIP](https://www.php.net/zip) (for import/export), [zlib](https://www.php.net/zlib) (for compressed feeds)
-* MySQL 5.5.3+ or MariaDB equivalent, or SQLite 3.7.4+, or PostgreSQL 9.5+
+	* Required extensions: [cURL](https://www.php.net/curl), [DOM](https://www.php.net/dom), [JSON](https://www.php.net/json), [XML](https://www.php.net/xml), [session](https://www.php.net/session), [ctype](https://www.php.net/ctype)
+	* Recommended extensions: [PDO_SQLite](https://www.php.net/pdo-sqlite) (for export/import), [GMP](https://www.php.net/gmp) (for API access on 32-bit platforms), [IDN](https://www.php.net/intl.idn) (for Internationalized Domain Names), [mbstring](https://www.php.net/mbstring) (for Unicode strings), [iconv](https://www.php.net/iconv) (for charset conversion), [ZIP](https://www.php.net/zip) (for import/export), [zlib](https://www.php.net/zlib) (for compressed feeds)
+	* Extension for database: [PDO_PGSQL](https://www.php.net/pdo-pgsql) or [PDO_SQLite](https://www.php.net/pdo-sqlite) or [PDO_MySQL](https://www.php.net/pdo-mysql)
+* PostgreSQL 9.5+ or SQLite or MySQL 5.5.3+ or MariaDB 5.5+
 
 # [Installation](https://freshrss.github.io/FreshRSS/en/admins/03_Installation.html)