[release-branch.go1.14] doc: add Go 1.14 to release history

Change-Id: I02afbd08ce9e0cd2af8953693b9c3066f6465914
Reviewed-on: https://go-review.googlesource.com/c/go/+/220937
Reviewed-by: Carlos Amedee <carlos@golang.org>
diff --git a/doc/contrib.html b/doc/contrib.html
index bc19daf..f0a01c5 100644
--- a/doc/contrib.html
+++ b/doc/contrib.html
@@ -34,6 +34,7 @@
 <p>A <a href="/doc/devel/release.html">summary</a> of the changes between Go releases. Notes for the major releases:</p>
 
 <ul>
+	<li><a href="/doc/go1.14">Go 1.14</a> <small>(February 2020)</small></li>
 	<li><a href="/doc/go1.13">Go 1.13</a> <small>(September 2019)</small></li>
 	<li><a href="/doc/go1.12">Go 1.12</a> <small>(February 2019)</small></li>
 	<li><a href="/doc/go1.11">Go 1.11</a> <small>(August 2018)</small></li>