Prepare release

[talex5]

No description provided.

[dinosaure]

A review is also a work from my side, but I will not block this release...

[talex5]

OK. I've added you (and also removed #60 and #65 from here as they're not actually included in this release).

[talex5]

I tested the new release on ocluster (https://github.com/talex5/ocluster/pull/new/prometheus-1.4), which turned out to be an interesting case!

• ocluster-scheduler does its own metrics reporting rather than using Prometheus_unix.serve because it has multiple metrics endpoints (it re-exports per-worker metrics).
• ocluster-worker reports metrics over capnp-rpc, not HTTP.
• However, both still runs OK with 1.4 using the old deprecated functions, because they use Prometheus_unix.Logging to configure logging and that initialises the time function.
• But a unit-test failed because it uses collect to check the metrics without setting a time function.

That doesn't seem like it needs to be a blocker though.