Allow add previous exception in ConversionException

Update readme

Add missed end of comment

This branch seems to have been removed.

Use Docker consistently

They are no longer supported by their vendors, but until we do support
them, we should continue testing them.

It seems to be enabled by default.

Hopefully it will work more reliably.

PHP 7.4 has stable versions now.

When a Docker version of the build is available, use it.

Fix broken build

See https://www.postgresql.org/support/versioning/
See https://mariadb.com/kb/en/mariadb-server/

[pg] fix getting table information if search_path contains escaped schema name

Fixed the QueryBuilder::setMaxResults() signature to accept NULL

Fix unquoted stmt fragments backslash escaping

Fix docblock typos in DriverManager docs

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

Fix JOIN with no condition bug

also simplifies the code and now exactly matches postgresql search rules

Fix DebugStack#queries docblock type

Remove superfluous Configuration instance

A configuration instance is not strictly required by [DriverManager::getConnection](https://github.com/doctrine/dbal/blob/master/lib/Doctrine/DBAL/DriverManager.php#L139).

As an upside, it doesn't add an extra warning for people that use Psalm/PHPmd when starting off from the documentation example. As the Configuration class has an `@internal` block those tools threat it as the other meaning for `@internal`, as in class that is [internal to the library and not for public use](https://docs.phpdoc.org/references/phpdoc/tags/internal.html).

Fix breaks named parameters in Oracle