all: Update & rearrange the license notice

The license situation is a little bit fuzzy, since the actual code
state is based on various sources at different times. The most
common license statements in these sources use MIT wording, even if is
not explicitely referenced. So I keep it like that.

LICENSE

@@ -0,0 +1,41 @@
+# Updated 2018 and 2020
+# This module is based on the below cited resources, which are all
+# based on the documentation as provided in the Bosch Data Sheet and
+# the sample implementation provided therein.
+#
+# Final Document: BST-BME280-DS002-15
+#
+# Authors: Paul Cunnane 2016, Peter Dahlebrg 2016
+#
+# This module borrows from the Adafruit BME280 Python library. Original
+# Copyright notices are reproduced below.
+#
+# Those libraries were written for the Raspberry Pi. This modification is
+# intended for the MicroPython and esp8266 boards.
+#
+# Copyright (c) 2014 Adafruit Industries
+# Author: Tony DiCola
+#
+# Based on the BMP280 driver with BME280 changes provided by
+# David J Taylor, Edinburgh (www.satsignal.eu)
+#
+# Based on Adafruit_I2C.py created by Kevin Townsend.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#

bme280_float.py

@@ -1,4 +1,4 @@
-# Updated 2018
+# Updated 2018 and 2020
 # This module is based on the below cited resources, which are all
 # based on the documentation as provided in the Bosch Data Sheet and
 # the sample implementation provided therein.

bme280_int.py

@@ -1,4 +1,4 @@
-# Updated 2018
+# Updated 2018 and 2020
 # This module is based on the below cited resources, which are all
 # based on the documentation as provided in the Bosch Data Sheet and
 # the sample implementation provided therein.
@@ -39,10 +39,6 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
 #
-# Based on the documentation as provided in the Bosch Data Sheet and
-# the sample implementation provided therein.
-# Document BST-BME280-DS002-15
-#
 
 import time
 from ustruct import unpack, unpack_from