Update README with --no-preview option

README.md

@@ -78,9 +78,7 @@ Options:
 
  -l, --location-name TEXT Location name in string format
  -p, --pan-enhancement Enhance image with panchromatic band
- -pre, --preview-image Preview pre-processed low resolution RGB
- satellite image.
-
+ --no-preview Skip downloading of preview image
  -v, --vegetation Show Color Infrared image to highlight
  vegetation
 
@@ -103,13 +101,13 @@ To get a better image using felicette use:
 
  $ felicette -p -c 77.5385 8.0883
 
-`-pre` option downloads a low-res image for preview, to check if the image is worth your computation, Network I/O. :)
+`--no-preview` option doesn't download image to preview, and directly downloads and processes original data. Please use this if you're sure of the location/quality of the images to be generated by felicette with the args
 
- $ felicette -pre -p -c 77.5385 8.0883
+ $ felicette --no-preview -p -c 77.5385 8.0883
 
 `-v` option generates a [CIR](https://eos.com/color-infrared/) image to highlight vegetation in 'red' color. Note that, '-p' option isn't taken into consideration while generating CIR imagery in felicette.
 
- $ felicette -pre -v -l "Kanyakumari"
+ $ felicette -v -l "Kanyakumari"
 
 
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