language spec: 2.13 is no longer an upcoming version

partially addresses scala/bug#11566

spec/README.md

@@ -16,7 +16,7 @@ We aim to track the configuration GitHub Pages use but at times differences will
 
 ## Building
 
-Travis CI builds the spec automatically after every merged pull release and publishes to http://www.scala-lang.org/files/archive/spec/2.12/.
+Travis CI builds the spec automatically after every merged pull release and publishes to http://www.scala-lang.org/files/archive/spec/2.13/.
 
 To preview locally, run the following commands in the root of your checkout scala/scala:
 `bundle install` to install Jekyll and `bundle exec jekyll serve -d build/spec/ -s spec/ -w --baseurl=""` to start it,

spec/_config.yml

@@ -1,5 +1,5 @@
 baseurl: /files/archive/spec/2.13
-latestScalaVersion: 2.12
+latestScalaVersion: 2.13
 thisScalaVersion: 2.13
 versionCompareMessage: "an upcoming"
 safe: true

spec/_layouts/default.yml

@@ -33,7 +33,7 @@
   <header>
     <nav id="chapters">
       <a href="{{site.baseurl}}/" title="Table of Contents">Scala {{ site.thisScalaVersion }}</a>
-      <a id="github" href="https://github.com/scala/scala/tree/2.12.x/spec"><img src="public/images/[email protected]" alt="Edit at GitHub"></a>
+      <a id="github" href="https://github.com/scala/scala/tree/2.13.x/spec"><img src="public/images/[email protected]" alt="Edit at GitHub"></a>
       {% assign sorted_pages = site.pages | sort:"name" %}
       {% for post in sorted_pages %}
         {% if post.chapter >= 0 %}