content: add go1.13.article
Updates golang/go#27155
Change-Id: I54310852ace172ffa0d900f20402bf364bbb7034
Reviewed-on: https://go-review.googlesource.com/c/blog/+/192741
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
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+Go 1.13 is released
+03 Sep 2019
+
+Andrew Bonventre
+
+* Introduction
+
+Today the Go team is very happy to announce the release of Go 1.13. You can get it from the [[https://golang.org/dl][download page]].
+
+Some of the highlights include:
+
+- The `go` command now downloads and authenticates modules [[https://golang.org/doc/go1.13#introduction][using the Go module mirror and Go checksum database by default]]
+- [[https://golang.org/doc/go1.13#language][Improvements to number literals]]
+- [[https://golang.org/doc/go1.13#error_wrapping][Error wrapping]]
+- [[https://golang.org/doc/go1.13#tls_1_3][TLS 1.3 on by default]]
+- [[https://golang.org/doc/go1.13#modules][Improved modules support]]
+
+For the complete list of changes and more information about the improvements above, see the [[https://golang.org/doc/go1.13][*Go*1.13*release*notes*]].
+
+We want to thank everyone who contributed to this release by writing code, filing bugs, providing feedback, and/or testing the beta and release candidates.
+Your contributions and diligence helped to ensure that Go 1.13 is as stable as possible.
+That said, if you notice any problems, please [[https://golang.org/issue/new][file an issue]].
+
+We hope you enjoy the new release!
