Enable JPMS for javalin-ssl

[bjorndarri]

Seeing that Javalin Core just got JPMS enabled (Add JPMS to Core Javalin) it would be great if the same could be done for this library.

The sslcontext-kickstart library just got modularised (Add support for java modules) in version 8.0.0, with minor breaking changes in package names.

I've implemented this in the modules branch of a fork of mine.

I'm not planning on creating a pull-request, since this change seems quite trivial (and I had to add a jetbrains.annotations dependency, which makes me think I'm misundarstanding something 😄), so just take this as an example of how this could be done.

[zugazagoitia]

Please do open the PR and I'll look at it by the end of the week!

[bjorndarri]

Here you go: #85

[zugazagoitia]

Closed by #85