feat(0.5) update current version to 0.5 (#234)

Author: rockerBOO

index.html

@@ -110,7 +110,7 @@ <h2 id="faqs">FAQ</h2>
         <dt>What is the project status?</dt>
         <dd>
           The current <a href="https://github.com/neovim/neovim/releases/latest">stable release</a>
-          version is <code>0.4.4</code> (<a href="https://github.com/neovim/neovim/tags.atom">RSS</a>).
+          version is <code>0.5</code> (<a href="https://github.com/neovim/neovim/tags.atom">RSS</a>).
           See the <a href="roadmap/">roadmap</a> for progress and plans.
         </dd>