Apply fixes from StyleCI

src/Grid/Column.php

@@ -756,7 +756,7 @@ class Column
 
         return implode(' ', $attrArr);
     }
-    
+
     /**
      * Display column as boolean , `✓` for true, and `✗` for false.
      *
@@ -774,7 +774,6 @@ class Column
         });
     }
 
-
     /**
      * Passes through all unknown calls to builtin displayer or supported displayer.
      *