Travis build: 855 [ci skip]

snippets/once.md

@@ -10,8 +10,8 @@ const once = fn => {
   let called = false;
   return function(...args) {
     if (called) return;
-    called = true;
-    return fn.apply(this, args);
+    called = true;
+    return fn.apply(this, args);
   };
 };
 ```