v3.4.1

Added:

• license_file is required for GPL, MIT, BSD, APACHE, PSF

Changed:

• build-locally.py now uses python3 even if python is python2 (Python 3.6+ was already required)

Removed:

• Github issue, PR and contributing files are removed as they are in https://github.com/conda-forge/.github
• Support for python 2 Removed

Fixed:

• Fix configuring appveyor on repos starting with an underscore
• Fixed an issue where conda system variants could be used after rendering migrations.
• Fixed issue where only the last maintainer is review requested
• Unlicense is allowed
• Support newer shyaml versions by checking whether shyaml -h succeeds.