Require Python 3.7+

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.7, 3.8]
 
     steps:
     - name: Check out source code

setup.py

@@ -17,7 +17,7 @@ setup(
     long_description_content_type="text/markdown",
     url="https://github.com/ANL-CEEESA/MIPLearn/",
     packages=find_namespace_packages(),
-    python_requires=">=3.6",
+    python_requires=">=3.7",
     install_requires=[
         "matplotlib>=3,<4",
         "networkx>=2,<3",