Update README.md

Missing requirements in readme

Author: thesteve0

README.md

@@ -31,9 +31,13 @@ The plugin provides a seamless interface to Moondream2's capabilities within Fif
 If you haven't already, install FiftyOne and required dependencies:
 
 ```bash
-pip install -U fiftyone transformers torch
+pip install -U fiftyone transformers torch pvips
 ```
+On Ubuntu you may need to also install the pvips libraries
 
+```bash
+sudo apt install imagemagick libvips
+```
 
 Then, install the plugin:
 
@@ -165,4 +169,4 @@ You can visit the original GitHub or the [Moondream website](https://moondream.a
     url = {https://github.com/vikhyat/moondream},
     commit = {main}
 }
-```
+```