blog: add 2020 developer survey announcement

Adds an announcement for the Go Developer Survey 2020.

Change-Id: I5a7a0a0e33b7be198148f2a017122bec10dc615e
Reviewed-on: https://go-review.googlesource.com/c/blog/+/263697
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
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+# Announcing the 2020 Go Developer Survey
+20 Oct 2020
+Tags: survey, community
+Summary: Please take the 2020 Go Developer Survey. We want to hear from you!
+
+Alice Merrick
+amerrick@google.com
+
+## Help shape the future of Go
+
+Since 2016, thousands of Gophers around the world have helped the Go project
+by sharing their thoughts via our annual Go Developer Survey.
+Your feedback has played an enormous role in driving changes to our language,
+ecosystem, and community, including the gopls language server,
+the latest generics draft, the module mirror, and so much more.
+And of course, we publicly share [each year's results](https://blog.golang.org/survey2019-results),
+so we can all benefit from the community's insights.
+
+This year we’ve streamlined the survey to shorten the time it takes to
+complete and improved the survey’s accessibility.
+The specific questions each person will see are randomly selected,
+so folks who’ve taken the survey in prior years may not see all of the
+questions they are used to.
+Rest assured that they are still there. This approach allows us to ask about
+a wider variety of topics than in prior years while also reducing the survey’s length.
+
+Today we are launching the 2020 Go Developer Survey.
+We'd love to hear from everyone who uses Go,
+used to use Go, or is interested in using Go,
+to help ensure the language, community, and ecosystem fit the needs of the
+people closest to it.
+Please help us shape Go's future by participating in this 10-minute survey by November 8th:
+[Take the 2020 Go Developer Survey](https://google.qualtrics.com/jfe/form/SV_1O0A5f70Q38dlVr).
+
+## Spread the word!
+
+We need as many Gophers as possible to participate in this survey to help
+us better understand our global user base.
+We'd be grateful if you would spread the word by sharing this post on your
+social network feeds,
+around the office, at virtual meet-ups, and in other communities. Thank you!