DOC: add instructions to deprecation notice (#86)

.github/workflows/main.yml

@@ -16,15 +16,14 @@ jobs:
   test_install:
     runs-on: ${{ matrix.os }}
     strategy:
-      max-parallel: 4
       matrix:
-        os: [ 'windows-latest', 'macos-latest', 'ubuntu-latest' ]
+        os: [ 'windows-2022', 'macos-13', 'ubuntu-22.04' ]
         python: [ '3.7', '3.8', '3.9', '3.10', '3.11' ]
         arch: [ 'x64', 'x86' ]
         exclude:
-          - os: macos-latest
+          - os: macos-13
             arch: x86
-          - os: ubuntu-latest
+          - os: ubuntu-22.04
             arch: x86
 
     steps:

README.rst

@@ -17,8 +17,23 @@ NumPy 1.xx and 2.0.
 
 All users should migrate to expressing a build dependency on ``numpy``
 directly, according to the guidance given in
-`Adding a dependency on NumPy <https://numpy.org/devdocs/dev/depending_on_numpy.html#adding-a-dependency-on-numpy>`__.
+`Adding a dependency on NumPy <https://numpy.org/doc/2.1/dev/depending_on_numpy.html#build-time-dependency>`__.
 
+.. code:: toml
+
+    [build-system]
+    requires = ["numpy>=2.0,<3"]
+
+Python 3.13 is supported as of NumPy 2.1. For older Python versions
+this package can still be used to compile against NumPy 1.xx.
+
+.. code:: toml
+
+    [build-system]
+    requires = [
+        "oldest-supported-numpy; python_version<='3.8'",
+        "numpy>=1.25,<2; python_version>'3.8'",
+    ]
 
 About
 -----