Deprecation warning of the punycode module

[Yoana Marinova Marinova]

Since NodeJS deprecate punycode, the following warning is generated:

(node:24860) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
    at Object.<anonymous> (..\node_modules\mailparser\lib\mail-parser.js:8:18)

Here is the documentation.

Users currently depending on the punycode module should switch to using the userland-provided Punycode.js module instead.