adding SPDX to callibration.py
+# SPDX-FileCopyrightText: 2022 Liz Clark for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
callibration = {
'offset_val' : 60.8006, # default offset for 6 lbs
'weight' : 2721.55 # 6 lbs in grams
