Documentation changes for PDO support

CHANGELOG

@@ -1,3 +1,9 @@
+Version 0.3.0 (2018-??-??)
+==========================
+
+New features:
+- Support for SQLite3 via PDO
+
 Version 0.2.1 (2017-12-07)
 ==========================
 

README.md

@@ -17,7 +17,7 @@ The Arsse has the following requirements:
 - PHP 7.0.7 or later with the following extensions:
     - [intl](http://php.net/manual/en/book.intl.php), [json](http://php.net/manual/en/book.json.php), [hash](http://php.net/manual/en/book.hash.php), and [pcre](http://php.net/manual/en/book.pcre.php)
     - [dom](http://php.net/manual/en/book.dom.php), [simplexml](http://php.net/manual/en/book.simplexml.php), and [iconv](http://php.net/manual/en/book.iconv.php) (for picoFeed)
-    - [sqlite3](http://php.net/manual/en/book.sqlite3.php)
+    - [sqlite3](http://php.net/manual/en/book.sqlite3.php) or [pdo_sqlite](http://ca1.php.net/manual/en/ref.pdo-sqlite.php)
 - Privileges to create and run daemon processes on the server
 
 ## Installation