Add build constraints for wheelwright (#25)

Author: adrianeboyd

build-constraints.txt

@@ -0,0 +1,8 @@
+# build version constraints for use with wheelwright + multibuild
+numpy==1.15.0; python_version<='3.7' and platform_machine!='aarch64'
+numpy==1.19.2; python_version<='3.7' and platform_machine=='aarch64'
+numpy==1.17.3; python_version=='3.8' and platform_machine!='aarch64'
+numpy==1.19.2; python_version=='3.8' and platform_machine=='aarch64'
+numpy==1.19.3; python_version=='3.9'
+numpy==1.21.3; python_version=='3.10'
+numpy; python_version>='3.11'