Merge branch 'master' into dev

Author: risenW

src/danfojs-browser/package.json

@@ -34,7 +34,7 @@
     "build:clean": "rimraf ./dist && rimraf ./lib && node ./scripts/prebuild.js && yarn run build",
     "dev": "nodemon",
     "lint": "eslint ./src",
-    "bundle": "webpack --mode development",
+    "bundle": "webpack --mode production",
     "coveralls": "cat ./coverage/lcov.info | ./node_modules/.bin/coveralls",
     "coverage": "nyc report --reporter=text-lcov | coveralls && nyc report --reporter=lcov",
     "patch": "npm version patch"

src/danfojs-browser/tsconfig.json

@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
-    "module": "es2015",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
+    "module": "CommonJS",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
     "moduleResolution": "node",
     "lib": ["es6", "dom"],                           /* Specify library files to be included in the compilation. */
     "allowJs": true,                          /* Allow javascript files to be compiled. */