0.4.20 release planning

[hoodmane]

Currently to build downstream packages for targets emscripten, I clone a fork of chrono with #593 backported onto v0.4.19 and patch the downstream package's Cargo.toml by adding

+[patch.crates-io]
+chrono = { path =  "path/to/forked/chrono" }

I am looking forward to not having to do this.

[djc]

We can do a beta release for now, see #676. In order to get to a 0.4.20 final release I want to merge #677 (or some other solution for #499) and ideally we'll then do some release candidate testing.

[cramhead]

I notice that version 0.4.19 is using version 0.1.43 of the time crate. I noticed https://rustsec.org/advisories/RUSTSEC-2020-0071 today via cargo audit. After looking into time a little I see that time is now on version 0.3.9, https://github.com/time-rs/time/blob/main/Cargo.toml.
Could we add an upgrade to time to the next release?
I'd be happy to contribute, but I'm pretty new to rust.

[Stargateur]

@cramhead this CVE doesn't affect chrono see #602

[krojew]

Any info when the new version will be released?