python:
  - 3.6
  - 3.7
  - 3.8
  - 3.9
numpy:
  - 1.15
  - 1.15
  - 1.17
  - 1.20
zip_keys:
  - python
  - numpy

python:
#   - 3.6
#   - 3.7
  - 3.8
#   - 3.9
numpy:
#   - 1.15
#   - 1.15
  - 1.17
#   - 1.20
zip_keys:
  - python
  - numpy

Build only Python 3.8 for CI testing
Build only Python 3.8 for CI testing