#102 issue: Update index.js

[aAYUSHkujur]

I am changing syntax according to the need.

[nukosuke]

There is a regression in current master branch.

(master)> yarn build
(master)> git diff

diff --git a/dist/index.js b/dist/index.js
index a7aedbf..ad91831 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -56,7 +56,7 @@ export function encodeTime(now, len) {
     if (now < 0) {
         throw createError("time must be positive");
     }
-    if (Number.isInteger(Number(now)) === false) { 
+    if (Number.isInteger(now) === false) {
         throw createError("time must be an integer");
     }
     let mod;

This PR modifies the transpiled distribution code and does not appear to be an appropriate fix.
The corresponding section in lib/index.ts needs to be modified in the same way.

[nukosuke]

I created PR for this. take a look at #114.