resize/width/height/image
Auto-resize: https://image-resizer-clj.herokuapp.com/resize/400/400/untitled.png
Resize to height: https://image-resizer-clj.herokuapp.com/resize/_/200/untitled.png
Resize to width: https://image-resizer-clj.herokuapp.com/resize/200/_/untitled.png
Force resize: https://image-resizer-clj.herokuapp.com/resize!/400/400/untitled.png