MariaDB in README

[robertsilen]

Any reason MariaDB is not mentioned in the list of databases in the README? Could it be added?

[brandond]

We're kinda just listing the backend drivers that we support:

kine/pkg/endpoint/endpoint.go

Lines 31 to 37 in edd8f35

	SQLiteBackend = "sqlite"
	DQLiteBackend = "dqlite"
	ETCDBackend = "etcd3"
	JetStreamBackend = "jetstream"
	NATSBackend = "nats"
	MySQLBackend = "mysql"
	PostgresBackend = "postgres"

Since there is no mariadb-specific driver, we don't call it out. If you wanted to open a PR to call it mysql/mariadb in the readme that would probably be accepted.

[robertsilen]

Thanks @brandond , makes sense, I opened PR #303