Support trailing comments

[yassenb]

The original Ruby dotenv supports trailing comments as it is valid shell syntax. In general it would be good to conform to the regular expression as defined here: https://github.com/bkeepers/dotenv/blob/master/lib/dotenv/parser.rb#L14-L30

[yassenb]

@all-contributors , can someone please take a look at this?

[allcontributors[bot]]

@yassenb

I could not determine your intention.

Basic usage: @all-contributors please add @someone for code, doc and infra

For other usages see the documentation

[cdimascio]

@all-contributors add @yassenb for code

[allcontributors[bot]]

@cdimascio

I've put up a pull request to add @yassenb! :tada: