Add jprofiler link

Author: jknack

README.md

@@ -5,6 +5,7 @@
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.jooby/jooby/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.jooby/jooby)
 [![ASF2](http://img.shields.io/badge/license-ASF2-blue.svg)](http://www.apache.org/licenses/LICENSE-2.0.txt)
 [![Twitter @joobyproject](https://img.shields.io/badge/twitter--blue.svg)](https://twitter.com/joobyproject)
+[![jprofiler](https://www.ej-technologies.com/images/product_banners/jprofiler_small.png)](https://www.ej-technologies.com/products/jprofiler/overview.html)
 
 # ∞ do more, more easily