Switch from Travis CI and Coveralls to GH Actions and Codecov

Free Travis CI is shutting down and since I already have Codecov set up
in other projects instead of Coveralls I'm switching that too for
consistency.

There's no nightly so I left it out for now.

.github/workflows/ci.yml

@@ -0,0 +1,28 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        python-version: [3.6, 3.7, 3.8, 3.9, pypy3]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        pip install --upgrade -r requirements.txt -r requirements-dev.txt
+        pip install .
+    - name: Run tests
+      run: |
+        py.test -vv --cov=injector --cov-branch --cov-report html --cov-report term
+        if which mypy; then mypy injector ; fi
+        if which black; then black --check . ; fi
+    - name: Report coverage to Codecov
+      uses: codecov/codecov-action@v1

README.md

@@ -1,8 +1,8 @@
 Injector - Python dependency injection framework, inspired by Guice
 ===================================================================
 
-[![image](https://secure.travis-ci.org/alecthomas/injector.svg?branch=master)](https://travis-ci.org/alecthomas/injector)
-[![Coverage Status](https://coveralls.io/repos/github/alecthomas/injector/badge.svg?branch=master)](https://coveralls.io/github/alecthomas/injector?branch=master)
+[![image](https://github.com/alecthomas/injector/workflows/CI/badge.svg)](https://github.com/alecthomas/injector/actions?query=workflow%3ACI+branch%3Amaster)
+[![Coverage Status](https://codecov.io/gh/alecthomas/injector/branch/master/graph/badge.svg)](https://codecov.io/gh/alecthomas/injector)
 
 Introduction
 ------------

docs/index.rst

@@ -6,13 +6,14 @@
 Welcome to Injector's documentation!
 ====================================
 
-.. image:: https://travis-ci.org/alecthomas/injector.png?branch=master
+.. image:: https://github.com/alecthomas/injector/workflows/CI/badge.svg
    :alt: Build status
-   :target: https://travis-ci.org/alecthomas/injector
+   :target: https://github.com/alecthomas/injector/actions?query=workflow%3ACI+branch%3Amaster
 
-.. image:: https://coveralls.io/repos/github/alecthomas/injector/badge.svg?branch=master
+.. image:: https://codecov.io/gh/alecthomas/injector/branch/master/graph/badge.svg
    :alt: Covergage status
-   :target: https://coveralls.io/github/alecthomas/injector?branch=master
+   :target: https://codecov.io/gh/alecthomas/injector
+
 
 GitHub (code repository, issues): https://github.com/alecthomas/injector
 

requirements-dev.txt

@@ -1,5 +1,4 @@
 pytest
-coveralls
 pytest-cov>=2.5.1
 dataclasses;python_version<"3.7"
 mypy;implementation_name=="cpython"