Metrics epub

[Heiko Rupp]

Hey,

I went through the Metrics spec source and made some changes to anchors and section setup to allow to render it as epub as well.

PR is at https://github.com/eclipse/microprofile-metrics/pull/383

The result can be seen here: https://www.dropbox.com/s/hpoue7o5zwtges6/microprofile-metrics-spec-2.1-SNAPSHOT.epub?dl=0

Now: for the title page I would need a more official image - who could create this?

Would we want to publish such epub versions to e.g. the Apple Books store?