Resurrect CI pipeline with github actions, update classifiers accordingly

Author: v-morello

.github/workflows/CI.yml

@@ -0,0 +1,32 @@
+name: CI
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  # See: https://docs.github.com/en/actions/writing-workflows/workflow-syntax-for-github-actions#example-running-a-job-within-a-container
+  continuous-integration:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install
+        run: |
+          python -m pip install --upgrade pip
+          make install
+      - name: Test
+        run: |
+          make tests
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v5
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

.travis.yml

@@ -1,4 +1,4 @@
-[![arXiv](http://img.shields.io/badge/astro.ph-2004.03701-B31B1B.svg)](https://arxiv.org/abs/2004.03701)   ![License](https://img.shields.io/badge/License-MIT-green.svg)   ![Python versions](https://img.shields.io/pypi/pyversions/riptide-ffa.svg)   [![Build Status](https://travis-ci.com/v-morello/riptide.svg?branch=master)](https://travis-ci.com/v-morello/riptide)   [![codecov](https://codecov.io/gh/v-morello/riptide/branch/master/graph/badge.svg)](https://codecov.io/gh/v-morello/riptide)
+[![arXiv](http://img.shields.io/badge/astro.ph-2004.03701-B31B1B.svg)](https://arxiv.org/abs/2004.03701)   ![License](https://img.shields.io/badge/License-MIT-green.svg)   ![Python versions](https://img.shields.io/pypi/pyversions/riptide-ffa.svg)  ![CI status](https://github.com/v-morello/riptide/actions/workflows/CI.yml/badge.svg?branch=master)   [![codecov](https://codecov.io/gh/v-morello/riptide/branch/master/graph/badge.svg)](https://codecov.io/gh/v-morello/riptide)
 
 # riptide
 

README.md

@@ -9,10 +9,11 @@ long_description_content_type = text/markdown
 license = MIT License
 license_file = LICENSE
 classifiers =
-    Programming Language :: Python :: 3.6
-    Programming Language :: Python :: 3.7
-    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
     Programming Language :: C
     License :: OSI Approved :: MIT License
     Operating System :: Unix