blog: Rename announce blog post

Taking v0.4.0 out of the actual blog post title makes it a little less
confusing.

website/blog/2018-01-23-new-dep-release-new-docs.md

@@ -1,5 +1,5 @@
 ---
-title: Announcing dep v0.4.0 (with docs!)
+title: A new dep release, and new docs!
 author: sam boyer
 authorURL: http://twitter.com/sdboyer
 ---