fix: fix for tests

There seems to be a process to publish the module that renames the bundle-esm.js file to bundle.js. I don't know why we need to name the webpack generated file with the -esm suffix.

Author: Mathieu Davy

src/danfojs-browser/package.json

@@ -4,7 +4,7 @@
   "description": "JavaScript library providing high performance, intuitive, and easy to use data structures for manipulating and processing structured data.",
   "main": "dist/danfojs-browser/src/index.js",
   "types": "dist/danfojs-browser/src/index.d.ts",
-  "module": "lib/bundle-esm.js",
+  "module": "lib/bundle.js",
   "directories": {
     "test": "tests"
   },

src/danfojs-browser/webpack.config.js

@@ -12,7 +12,7 @@ const createConfig = () => {
     target: "web",
     output: {
       path: path.resolve(__dirname, "lib"),
-      filename: "bundle-esm.js",
+      filename: "bundle.js",
       library: "dfd"
     },
     module: {