chore: fix readme

Author: tensorush

README.md

@@ -19,9 +19,11 @@ const quickphf_dep = b.dependency("quickphf", .{
 });
 const quickphf_mod = quickphf_dep.module("quickphf");
 
-...
+const root_mod = b.createModule(.{
+    .target = target,
+    .optimize = optimize,
     .imports = &.{
         .{ .name = "quickphf", .module = quickphf_mod },
     },
-...
+});
 ```