update README

Author: motdotla

README.md

@@ -4,6 +4,8 @@
 
 Dotenv is a zero-dependency module that loads environment variables from a `.env` file into [`process.env`](https://nodejs.org/docs/latest/api/process.html#process_process_env). Storing configuration in the environment separate from code is based on [The Twelve-Factor App](https://12factor.net/config) methodology.
 
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 [Watch the tutorial](https://www.youtube.com/watch?v=YtkZR0NFd1g)