update README

Author: motdotla

README.md

@@ -4,8 +4,6 @@
 
 > 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.
 
-### Quickstart
-
 Install it.
 
 ```sh