Bump min supported Python version to 3.6

Author: christiansandberg

.github/workflows/pythonpackage.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.5, '3.x']
+        python-version: [3.6, '3.x']
 
     steps:
     - uses: actions/checkout@v2

README.rst

@@ -6,7 +6,7 @@ The aim of the project is to support the most common parts of the CiA 301
 standard in a simple Pythonic interface. It is mainly targeted for testing and
 automation tasks rather than a standard compliant master implementation.
 
-The library supports Python 3.4+.
+The library supports Python 3.6+.
 
 
 Features