MLBEDSW-5912 - Update to Python 3.8

Change required python version from 3.6 to 3.8 in setup.py and allow
any python3 version for black pre-commit linting.

Signed-off-by: Rickard Bolin <rickard.bolin@arm.com>
Change-Id: I0d8936d92efd5137561834c0de1a3449f9e5f25c
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 14d098b..17d3877 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -9,7 +9,7 @@
     rev: 19.10b0
     hooks:
     -   id: black
-        language_version: python3.6
+        language_version: python3
         args: [--line-length=120]
 
 -   repo: https://gitlab.com/pycqa/flake8