package/python-periphery: bump to version 2.1.0

See changelog https://github.com/vsergeev/python-periphery/blob/master/CHANGELOG.md



Update the license hash for a change in copyright years:
-Copyright (c) 2015-2019 vsergeev / Ivan (Vanya) A. Sergeev
+Copyright (c) 2015-2020 vsergeev / Ivan (Vanya) A. Sergeev

Also switch to the new 2 spaces convention for the hash file

Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>