correct info to process images

The commands to process and image where outdated. For predicting more than a single image probably needs to be updated as well

Author: esgomezm

README.md

@@ -73,7 +73,7 @@ bioimageio test-model <MODEL>
 
 Run prediction for an image stored on disc:
 ```
-bioimageio predict-image -m <MODEL> -i <INPUT> -o <OUTPUT>
+bioimageio predict-image <MODEL> --inputs <INPUT> --outputs <OUTPUT>
 ```
 
 Run prediction for multiple images stored on disc: