Please add type definitions

[bkawk]

In the readme, you show a typescript example but there are no type definitions, please could you add some?

error An unexpected error occurred: "https://registry.yarnpkg.com/@types%2fnode-email-validation: Not found".

[andrewdoyle19]

I found that the typescript info wasn't quite accurate.

I ended up putting the following in a declarations.d.ts file.

declare module "node-email-validation" {
  function is_email_valid(email: string): boolean
  export = is_email_valid
}

I also had to change the import to be
import EmailValidator from 'node-email-validation'