Add missing index.html src include

Author: Avaer Kazmer

index.html

@@ -5730,6 +5730,7 @@
 })();
     </script>
     <!-- <audio src="background.mp3" autoplay loop></audio> -->
+    <script src="bignumber.js"></script>
     <script src="web3.js"></script>
     <script src="bip32.js"></script>
     <script src="bip39.js"></script>