Add short paragraph mentioning next steps to get started.

For people new to GopherJS who may see this post, this gives them some
actionable next steps to perform.

It gives a little more meaning to the sign off phrase.

It also indirect shows that the GopherJS playground has been updated
for Go 1.7/GopherJS 1.7-1.

Author: dmitshur

_posts/blog/2016-08-21-gopherjs-1.7-1-release.markdown

@@ -21,4 +21,9 @@ However, many of those improvements to GopherJS were done quietly and internally
 
 In closing, we would like to thank everyone who contributed to this release of GopherJS. The Go team created and released Go 1.7. Richard Musiol created and implemented the core parts of GopherJS and Go 1.7 support. Many people have contributed code and bug fixes, reported/investigated/helped reproduce issues, created libraries and wrappers for various browser APIs. Everyone's effort has helped get GopherJS to where it is today, giving us the opportunity to write front-end code in Go which will run in all modern browsers. See [list of code contributors](https://github.com/gopherjs/gopherjs/graphs/contributors) and [list of closed issues](https://github.com/gopherjs/gopherjs/issues?q=is%3Aissue+is%3Aclosed). We welcome all help; if you'd like to get involved, see the [community section](https://github.com/gopherjs/gopherjs#community). If you have a good experience with GopherJS, tell your fellow gophers about it!
 
+If you'd like to get started with GopherJS, here are some next steps you can take:
+
+-	Try it right now in your browser with the [GopherJS playground](http://www.gopherjs.org/playground/#/-MweO3kLBk).
+-	Begin creating your web app using the [gopherpen template project](https://github.com/gopherjs/gopherpen#readme) as a starting point.
+
 Happy surfing with Go 1.7 and GopherJS 1.7-1!