Update typo in src

src/wait.ts

@@ -1,10 +1,10 @@
 export function wait(milliseconds: number) {
     return new Promise((resolve) => {
         if (isNaN(milliseconds)) { 
-            throw new Error('milleseconds not a number'); 
+            throw new Error('milliseconds not a number'); 
         }
 
         setTimeout(() => resolve("done!"), milliseconds)
     });
 }
-  
+