show 7 days per week in docs, fixes #12

Now you can’t hide anymore that you don’t commit on Sundays ;)

docs/index.html

@@ -215,7 +215,7 @@
     parent: "#heatmap",
     data: heatmap_data,  // object with date/timestamp-value pairs
     type: 'heatmap',
-    height: 100,
+    height: 115,
     discrete_domains: 1  // default 0
   });</code></pre>
             </div>