RFC: poll for summit 2020 dates

[Vagrant Cascadian]

I've drafted a poll to get a rough idea of which dates would be better
for the 2020 Reproducible Builds Summit:

  https://framadate.org/dgT3WjvTV3AdfQWp

It was a little awkward to put the full date ranges in, so I simply
selected the wednesday of each week we might do the event and added
explanatory text. Hopefully it makes sense!

After a few days, I'll drop the "Request For Comment" and we'll open the
polling for real!


live well,
  vagrant
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