Enable experimental proxy via configuration option 'experimental_proxy'

Change-Id: I3c5532d661327e3be50153d1360f96b524c91f29
diff --git a/kalamar.conf b/kalamar.conf
index 889a8ca..6e61b15 100644
--- a/kalamar.conf
+++ b/kalamar.conf
@@ -36,17 +36,20 @@
     # Backend server path
     api_path => $ENV{'KALAMAR_API'} // $api,
 
-    # Backend API version
+    ## Backend API version
     # api_version => '1.0',
 
-    # The name of the base corpus,
-    # for query examples (see kalamar.queries.dict)
-    # examplecorpus => 'dereko'
+    ## The name of the base corpus,
+    ## for query examples (see kalamar.queries.dict)
+    # examplecorpus => 'dereko',
 
-    # For further Plugins, add them
-    # to this array:
-    # plugins => []
-    # Currently bundled: Piwik, Auth
+    ## For further Plugins, add them
+    ## to this array:
+    # plugins => [],
+    ## Currently bundled: Piwik, Auth
+
+    ## Add experimental features:
+    # experimental_proxy => 1,
   },
 
   # See Mojolicious::Plugin::TagHelpers::MailToChiffre