docs: added link on banner (#1944)

[skip ci]

Author: itsAftabAlam

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-  <img src="https://user-images.githubusercontent.com/13700/35731649-652807e8-080e-11e8-88fd-1b2f6d553b2d.png" alt="Nodemon Logo">
+  <a href="https://nodemon.io/"><img src="https://user-images.githubusercontent.com/13700/35731649-652807e8-080e-11e8-88fd-1b2f6d553b2d.png" alt="Nodemon Logo"></a>
 </p>
 
 # nodemon