Remove deprecated python version

Author: Petr Nechvátal

azure-devops/setup.py

@@ -25,7 +25,6 @@
  'Intended Audience :: System Administrators',
  'Programming Language :: Python',
  'Programming Language :: Python :: 3',
- 'Programming Language :: Python :: 3.6',
  'Programming Language :: Python :: 3.7',
  'Programming Language :: Python :: 3.8',
  'Programming Language :: Python :: 3.9',
@@ -47,7 +46,7 @@
  classifiers=CLASSIFIERS,
  packages=find_packages(),
  include_package_data=True,
- python_requires=">=3.6",
+ python_requires=">=3.7",
  long_description="""\
  """
 )