Feature window: open (but shorter than usual)

[Daniel Stenberg via curl-library]

Hi friends,

The clock is about to turn Monday here in a bit and we now officially open the
feature window for the coming 7.77.0 release. Use it wisely.

Due to the shorter release cycle this round, the feature window will only stay
open for 16 days this time - it closes on May 5.

There are already many pull-requests queued up right now that want to get
merged, so please join in and help us get them in best possible shape so that
we can land as many of them as possible in time.

There will for sure be some that won't make it in this time, but for them
there's always the next window!

curl 7.77.0 is due to ship on May 26, 2021. It will become the 200th curl
release ever.