Add post for Swift 4.2

mattt · mattt · commit b751d4f4ed98 · 2018-07-13T14:55:13.000-07:00
diff --git a/_posts/2018-07-09-Swift-4.2.md b/_posts/2018-07-09-Swift-4.2.md
@@ -0,0 +1,15 @@
+---
+layout: post
+tags:   release-notes
+title:  Swift 4.2
+class:  release
+description: ""
+---
+
+SwiftDoc has been updated to include information about
+the following Swift versions:
+[4.2](/v4.2/),
+[3.1](/v3.1/),
+[3.0](/v3.0),
+[2.2](/v2.2), and
+[2.1](/v2.1/).
