This release fixes the generation of default values of immutable date/datetime
times, default values of PostgreSQL's SERIAL types, and the required arguments
for SSL connections using MySQLi.

Also includes a fix for a BC-break related to json types comparison.

Total issues resolved: **11**

- [2815: mysqli ssl_key and ssl_cert should not be mandatory](https://github.com/doctrine/dbal/issues/2815) thanks to @gauauu
- [2816: #2815 don't require `ssl_key` and `ssl_cert` to use `ssl_ca`](https://github.com/doctrine/dbal/pull/2816) thanks to @gauauu
- [2596: Schema diff keeps thinking custom mapping types have changed](https://github.com/doctrine/dbal/issues/2596) thanks to @vicdelfant
- [2905: Fixes custom type comment regex](https://github.com/doctrine/dbal/pull/2905) thanks to @jeremy-smith-maco
- [2679: Fix: Doctrine custom types now accepts anything but ')'](https://github.com/doctrine/dbal/pull/2679) thanks to @PedroTroller
- [2907: Don't Set a Default Value on PostgreSQL SERIAL Fields](https://github.com/doctrine/dbal/pull/2907) thanks to @chrisguitarguy
- [2906: Cannot Generate [BIG]SERIAL Columns Without a Default or NOT NULL](https://github.com/doctrine/dbal/issues/2906) thanks to @chrisguitarguy
- [2859: DateTimeImmutable error with default value CURRENT_TIMESTAMP](https://github.com/doctrine/dbal/issues/2859) thanks to @tok-amsiq
- [2861: Default value declaration for immutable types](https://github.com/doctrine/dbal/pull/2861) thanks to @tok-amsiq
- [2880: Symfony 3 - Postgresql JSON type always appear in diff](https://github.com/doctrine/dbal/issues/2880) thanks to @PapsOu
- [2855: Fix BC-break regarding JsonArrayType](https://github.com/doctrine/dbal/pull/2855) thanks to @lcobucci