[ANN] U-Boot v2020.04-rc3 released

Hey all,

It's two days late, but here is v2020.04-rc3. The series to add htmldocs tests to CI that I added on Monday took longer than I had expected to go all green in CI. I was going to do this yesterday after applying the fixes that I pushed but got side-tracked, so here we are.

Once again, for a changelog, git log --merges v2020.04-rc2..v2020.04-rc3 and as always, I ask for more details in the PRs people send me so I can put them in the merge commit.

The final release is still on schedule for April 6th and I plan to open my -next branch on March 2nd. Thanks all!