• SqlBuilder: fixed compatiblity with PCRE2 used in PHP 7.3 #208 #210
• PgSqlDriver: uses cache for getColumnTypes() to avoid excessive number of queries #212
• SqlPreprocessor: enables database parameters only for SELECT, INSERT, UPDATE, DELETE, REPLACE and EXPLAIN #211
• Connection::quote() throws exception on error (related to #202)

For the details you can have a look at the diff.