doc: add Go Time podcast to the help page

Adding the Go Time podcast under the `Stay informed` section of the help
page on the website.

Change-Id: Ifb1c6bb20cbf640a91572d47f14a432f58439261
Reviewed-on: https://go-review.googlesource.com/41146Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

doc/help.html

@@ -59,6 +59,12 @@ The <a href="https://reddit.com/r/golang">golang sub-Reddit</a> is a place
 for Go news and discussion.
 </p>
 
+<h3 id="gotime"><a href="https://changelog.com/gotime">Go Time Podcast</a></h3>
+<p>
+The <a href="https://changelog.com/gotime">Go Time podcast</a> is a panel of Go experts and special guests
+discussing the Go programming language, the community, and everything in between.
+</p>
+
 <h2 id="community">Community resources</h2>
 
 <h3 id="go_user_groups"><a href="/wiki/GoUserGroups">Go User Groups</a></h3>