v1.8.1 breaks TypeScript support - index.d.ts has empty export

[msheakoski]

Commit 6844df0 causes index.ts to have an empty export export {}; when using the npm package.

It is no longer possible to import the package in TypeScript using import WebpackObfuscator from "webpack-obfuscator" and if you use const WebpackObfuscator = require("webpack-obfuscator") you do not get IDE auto-completion.

[sanex3339]

Try 1.11.1 version.