fix typo

build.js

@@ -39,7 +39,7 @@ try {
       runCommand("git", ["branch"])
         .split("* ")[1]
         .split(" ")[0] + (IS_DEV_MODE ? " - DEV MODE" : "");
-    if (["", "master].includes(version.variant))
+    if (["", "master"].includes(version.variant))
       delete version.variant;
 
     // Write version data into a file