update header with latest design

README.md

@@ -11,8 +11,7 @@ TODO
 - [x] landing page
 - [ ] news page
 - [x] help page
-- [ ] setup travis for generate_downloads.rb
-- [ ] update header to latest version (different logo)
+- [x] setup travis for generate_downloads.rb
+- [x] update header to latest version (different logo)
 - [x] deploy accounts, and update url to accounts production in download.js
-- [ ] setup travis for git commits (example: http://awestruct.org/auto-deploy-to-github-pages/)
 - [ ] authenticate github api for newsletter posts

_includes/header.html

@@ -2,8 +2,15 @@
   <div class="wrapper">
     <div class="content">
       <div class="site-brand">
-        <div class="site-logo"><a href="https://circuitpython.org"><img src="/assets/images/blinka.png" height="100" width="112"></a></div>
-        <div class="site-banner"><a href="https://circuitpython.org">CircuitPython</a></div>
+        <div class="site-logo">
+          <a href="https://circuitpython.org">
+            <img src="/assets/images/logo.png" srcset="/assets/images/logo.png 1x,
+                                         /assets/images/logo@2x.png 2x,
+                                         /assets/images/logo@3x.png 3x"
+                                         alt="CircuitPython Logo"
+                                         height="60" width="136">
+          </a>
+        </div>
       </div>
 
       <div class="site-navigation">