Update backers July 2019

docs/blog.html

@@ -38,7 +38,7 @@ breadcrumb:
         <div class="bd-content">
           <div class="bd-links">
             {% for post in site.posts %}
-              {% assign date = post.date | date_to_string %}
+              {% assign date = post.date | date: "%B %-d" %}
               {% assign more = post.introduction | markdownify | strip_html %}
               {%
                 include elements/link.html