Outdated connection URLs in README.adoc

[lukaseder]

Bug Report

Versions

• Driver: 0.8.4.RELEASE
• SPI: 0.9.0.M1
• Database: 1.4.200
• Java: openjdk version "11.0.9.1" 2020-11-04
• OS: Microsoft Windows [Version 10.0.19042.867]

Current Behavior

This code:

ConnectionFactories.get("r2dbc:h2:file///absolute/file/name");

Produces this exception

Exception in thread "main" java.lang.IllegalArgumentException: Invalid URL: r2dbc:h2:file///absolute/file/name
	at io.r2dbc.spi.ConnectionUrlParser.validate(ConnectionUrlParser.java:67)
	at io.r2dbc.spi.ConnectionUrlParser.parseQuery(ConnectionUrlParser.java:81)
	at io.r2dbc.spi.ConnectionFactoryOptions.parse(ConnectionFactoryOptions.java:124)
	at io.r2dbc.spi.ConnectionFactories.get(ConnectionFactories.java:130)
	at org.jooq.testscripts.R2DBC.main(R2DBC.java:23)

This is either a regression in the SPI (less likely), or a breaking change (more likely), after which the documentation of r2dbc-h2 should be updated:
https://github.com/r2dbc/r2dbc-h2/blob/main/README.adoc

[lukaseder]

Related (let me know if you wish for me to open a new bug for this).

This works with the above version configuration, but I doubt it should work:

ConnectionFactory f = ConnectionFactories.get(
    ConnectionFactoryOptions
        .parse("r2dbc:h2:file://localhost/~/test")
        .mutate()
        .option(ConnectionFactoryOptions.USER, "sa")
        .option(ConnectionFactoryOptions.PASSWORD, "")
        .build()
);

I tried random things until I got some r2dbc connection URL to work with the 0.9.0.M1 SPI and the 0.8.4.RELEASE driver.