[ANN] U-Boot v2020.04 released

Hey all,

As I announced last week, I pushed v2020.04 out a week to handle some regressions. Things are looking better now, so here's the release. As I've been taking pull requests for the next branch, we're going to stick with the general schedule for v2020.07 at this time. If it becomes an issue, I'll probably end up taking a few bigger pull requests than I would like for -rc2. Given the state of the world, if it takes people a little longer to pull something together, that'll be just fine.

In terms of a changelog, git log --merges v2020.04-rc5..v2020.04 or git log --merges v2020.01..v2020.04

The merge window is once again open and I plan to tag -rc1 on April 27th, bi-weekly -rcs thereafter and final release on July 6th, 2020.