Accidentally copied the wrong text without realising it. Change the
transformed text in the example to correctly illustrate what should
happen.

Instead of using the hash syntax to add our `message public` signal
listener, use the parameterised subroutine style call. Since we're only
adding a single signal, we don't really need to use the hash syntax.

I started out with it because I was following the example on
http://juerd.nl/site.plp/irssiscripttut

Now that this information is captured in the README, including it in its
own file is no longer necessary.

Include:

* A description of the plugin
* Requirements
* Installation instructions
* A note on testing
* License information

These single lines are irrelevant and don't need to be included in
output.

Change the format so that the title message is on a single line instead
of 3. Typically this will mean that the message will appear on 2 lines,
which is still better than 3 lines, saving us some vertical space.

Don't write blank messages, only write messages with text.

Use the `signal_continue` sub to continue sending the message with
transformed text.

Thanks so much to `Nei` on Freenode#irssi for recommending
`signal_continue`!

Decided to get all variables from the caller to be able to pass them on
to `signal_continue`.

Make the start message to correspond to the test expectation.

Grab the issue link first because that should tip us off that this is
the text that will give us the starter data.

Also chomp the newline from the test string to match the function
result.