Update 'README.md'

README.md

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 This toolbox uses the Google Earth Engine Python API to explore collections of publicly available satellite imagery (Landsat, Sentinel).
 
 It has .py routines to:
-	- read and preprocess satellite images (cloud masking, contrast stretching)
-	- pansharpen Landsat 8 images
-	- extract shorelines with the Marching Squares algorithm
+- read and preprocess satellite images (cloud masking, contrast stretching)
+- pansharpen Landsat 8 images
+- extract shorelines with the Marching Squares algorithm