readme fix

Author: pratikyadav

README.md

@@ -142,7 +142,7 @@ tilesets upload-raster-source <username> <source_id> ./file.tif
 
 # multiple files
 tilesets upload-raster-source <username> <source_id> file-1.tif file-4.tif
-
+```
 
 ### _deprecated_ add-source