update MXNet easyblock + don't try to install R extension by default for MXNet >= 1.0 #2509

	name: Static Analysis
	on: [push, pull_request]
	jobs:
	python-linting:
	runs-on: ubuntu-18.04
	steps:
	- uses: actions/checkout@v2

	- name: set up Python
	uses: actions/setup-python@v1
	with:
	python-version: 3.8

	- name: install Python packages
	run: \|
	pip install --upgrade pip
	pip install --upgrade flake8

	- name: Run flake8 to verify PEP8-compliance of Python code
	run: flake8

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