arm64 requires 1.20.0 or above (#20)

Co-authored-by: Ralf Gommers <[email protected]>

Author: kbourgoin

setup.cfg

@@ -35,12 +35,16 @@ install_requires =
     numpy==1.19.2; python_version=='3.7' and platform_machine=='aarch64'
     numpy==1.19.2; python_version=='3.8' and platform_machine=='aarch64'
 
+    # arm64 on Darwin supports Python 3.8 and above requires numpy>=1.20.0
+    numpy==1.20.0; python_version=='3.8' and platform_machine=='arm64' and platform_system=='Darwin'
+    numpy==1.20.0; python_version=='3.9' and platform_machine=='arm64' and platform_system=='Darwin'
+
     # default numpy requirements
     numpy==1.13.3; python_version=='3.5' and platform_machine!='aarch64' and platform_system!='AIX'
     numpy==1.13.3; python_version=='3.6' and platform_machine!='aarch64' and platform_system!='AIX' and platform_python_implementation != 'PyPy'
     numpy==1.14.5; python_version=='3.7' and platform_machine!='aarch64' and platform_system!='AIX' and platform_python_implementation != 'PyPy'
-    numpy==1.17.3; python_version=='3.8' and platform_machine!='aarch64' and platform_python_implementation != 'PyPy'
-    numpy==1.19.3; python_version=='3.9' and platform_python_implementation != 'PyPy'
+    numpy==1.17.3; python_version=='3.8' and (platform_machine!='arm64' or platform_system!='Darwin') and platform_machine!='aarch64' and platform_python_implementation != 'PyPy'
+    numpy==1.19.3; python_version=='3.9' and (platform_machine!='arm64' or platform_system!='Darwin') and platform_python_implementation != 'PyPy'
 
     numpy==1.19.0; python_version=='3.6' and platform_python_implementation=='PyPy'
     numpy==1.20.0; python_version=='3.7' and platform_python_implementation=='PyPy'