remove otbapplication import

sen2chain/indices_functions.py

@@ -7,7 +7,7 @@ This module contains functions to compute radiometric indices.
 import logging
 import pathlib
 from pathlib import Path
-import otbApplication
+#~ import otbApplication
 import rasterio
 from rasterio.warp import reproject, Resampling
 import numpy as np