Adds a filter to the FacetWP Alpha output

facetwp-alpha-filter.patch

diff --git a/class-alpha.php b/class-alpha.php
index b70c8b1..76b888a 100644
--- a/class-alpha.php
+++ b/class-alpha.php
@@ -86,7 +86,7 @@ class FacetWP_Facet_Alpha_Addon extends FacetWP_Facet
             }
         }
 
-        return $output;
+        return apply_filters( 'facetwp_alpha_render', $output );
     }