fix indentation of settings file

Author: Derek Tamsen

templates/gunicorn.erb

@@ -7,7 +7,7 @@ CONFIG = {
 <% if @virtualenv -%>
   'environment': {
 <% if @osenv -%><% @osenv.sort.each do |key, value| -%>
-  '<%= key %>': '<%= value %>',
+    '<%= key %>': '<%= value %>',
 <% end -%><% end -%>
 <% if @environment -%>
     'ENVIRONMENT': '<%= @environment %>',