Auto merge of #2016 - integer32llc:percy-media-query, r=jtgeibel

Use the percy media query method to hide the downloads graph from percy

This is a different attempt to fix the percy problems; the percy yaml config doesn't work with the ember-percy version we're currently on.

Author: bors

app/styles/app.scss

@@ -359,3 +359,9 @@ abbr[title] {
     text-decoration: none;
     border-bottom: 1px dotted;
 }
+
+@media only percy {
+    #crate-downloads .graph {
+       display: none;
+    }
+}