Drop support for Python 3.7 (#404)

Drop support for Python 3.7. Bump oldest version to 3.8 on test GH
Action. Update compatibility table. Bump minimum Numpy version to v1.21.

.github/workflows/test.yml

@@ -44,7 +44,7 @@ jobs:
  - optional
  include:
  - dependencies: oldest
- python: "3.7"
+ python: "3.8"
  - dependencies: latest
  python: "3.10"
  - dependencies: optional

doc/compatibility.rst

@@ -62,3 +62,5 @@ following releases to ensure compatibility:
  - **Last compatible release**
  * - 3.6
  - 0.4.0
+ * - 3.7
+ - 0.6.0

doc/install.rst

@@ -6,7 +6,7 @@ Installing
 Which Python?
 -------------
 
-You'll need **Python 3.7 or greater**.
+You'll need **Python 3.8 or greater**.
 See :ref:`python-versions` if you require support for older versions.
 
 We recommend using the

setup.cfg

@@ -23,7 +23,6 @@ classifiers =
  Topic :: Scientific/Engineering
  Topic :: Software Development :: Libraries
  Programming Language :: Python :: 3 :: Only
- Programming Language :: Python :: 3.7
  Programming Language :: Python :: 3.8
  Programming Language :: Python :: 3.9
  Programming Language :: Python :: 3.10
@@ -38,9 +37,9 @@ project_urls =
 zip_safe = True
 include_package_data = True
 packages = find:
-python_requires = >=3.7
+python_requires = >=3.8
 install_requires =
- numpy>=1.19
+ numpy>=1.21
  pandas>=1.1
  scipy>=1.5
  scikit-learn>=0.24