drop python3.6 support

.github/workflows/main.yml

@@ -1,6 +1,6 @@
 name: Python package
 
-on: 
+on:
   push:
   pull_request:
     types: [opened, synchronize]
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: ["3.6"]
+        python-version: ["3.7", "3.9", "3.12"]
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}
@@ -20,8 +20,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pytest
-          pip install .
+          pip install .[tests,apps]
       - name: Test with pytest
         run: |
           pytest

pyproject.toml

@@ -7,7 +7,6 @@ classifiers = [
     "License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
@@ -16,7 +15,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
 ]
 dynamic = ["version", "readme"]
-requires-python = ">=3.6"
+requires-python = ">=3.7"
 dependencies = [
     "numpy",        # for vector math
     "jsonschema",   # for spec validation
@@ -93,7 +92,7 @@ line-length = 120
 legacy_tox_ini = '''
     [tox]
     skip_missing_interpreters = True
-    envlist = py{36,37,38,39,310,311,312}
+    envlist = py{37,38,39,310,311,312}
 
     [testenv]
     usedevelop = True