README: Link to Over 9000 wiki page

Signed-off-by: Tomás Senart <tsenart@gmail.com>

README.md

@@ -1,7 +1,7 @@
 # Vegeta [![Build Status](https://github.com/tsenart/vegeta/workflows/CI/badge.svg)](https://github.com/tsenart/vegeta/actions) [![Go Report Card](https://goreportcard.com/badge/github.com/tsenart/vegeta)](https://goreportcard.com/report/github.com/tsenart/vegeta) [![PkgGoDev](https://pkg.go.dev/badge/github.com/tsenart/vegeta/v12/lib)](https://pkg.go.dev/github.com/tsenart/vegeta/v12/lib) [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/tsenart/vegeta?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge) [![Donate](https://img.shields.io/badge/donate-bitcoin-yellow.svg)](#donate)
 
 Vegeta is a versatile HTTP load testing tool built out of a need to drill
-HTTP services with a constant request rate.
+HTTP services with a constant request rate. [It's over 9000!](https://en.wikipedia.org/wiki/It's_Over_9000)
 
 ## Features