Merge pull request #446 from bashtage/final-fix

MAINT: Fix NumPy version

Author: bashtage

pyproject.toml

@@ -2,7 +2,7 @@
 requires = [
   "setuptools",
   "wheel",
-  "numpy==1.6.6; python_version<='3.7'",
+  "numpy==1.16.6; python_version<='3.7'",
   "numpy==1.17.5; python_version=='3.8'",
   "numpy==1.19.5; python_version=='3.9'",
   "numpy; python_version>='3.10'",