Move CI to GitHub actions

Travis has ceased working and no longer supports open source projects.
Switch to the popular and well support GitHub actions. Runs tests and
mypy as before.

.github/workflows/ci.yaml

@@ -0,0 +1,48 @@
+name: CI
+
+on:
+  - pull_request
+  - push
+
+jobs:
+  mypy:
+    name: mypy
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@master
+
+      - name: Set up Python
+        uses: actions/setup-python@v2
+
+      - name: Install tox
+        run: pip install tox
+
+      - name: Run tests
+        run: tox -e mypy
+
+  tests:
+    name: Python ${{ matrix.python-version }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version:
+          - 3.6
+          - 3.7
+          - 3.8
+          - 3.9
+          - pypy3
+
+    steps:
+      - uses: actions/checkout@master
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install tox
+        run: pip install tox
+
+      - name: Run tests
+        run: tox -e py

Makefile

@@ -8,9 +8,6 @@ test:
 	rm -f .coverage
 	pytest
 
-travis:
-	pytest --cov
-
 tag:
 	python create_tag.py
 

README.rst

@@ -3,8 +3,8 @@ FreezeGun: Let your Python tests travel through time
 
 .. image:: https://img.shields.io/pypi/v/freezegun.svg
    :target: https://pypi.python.org/pypi/freezegun/
-.. image:: https://secure.travis-ci.org/spulec/freezegun.svg?branch=master
-   :target: https://travis-ci.org/spulec/freezegun
+.. image:: https://github.com/spulec/freezegun/workflows/CI/badge.svg
+   :target: https://github.com/spulec/freezegun/actions
 .. image:: https://coveralls.io/repos/spulec/freezegun/badge.svg?branch=master
    :target: https://coveralls.io/r/spulec/freezegun
 

setup.cfg

@@ -13,6 +13,7 @@ classifiers =
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
     Programming Language :: Python :: Implementation :: CPython
     Programming Language :: Python :: Implementation :: PyPy
 

tox.ini

@@ -4,13 +4,13 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py36, py37, py38, pypy3, py{38}-mypy
+envlist = py36, py37, py38, py39, pypy3, mypy
 
 [testenv]
 commands = pytest --cov {posargs}
 deps = -rrequirements.txt
 
-[testenv:py38-mypy]
+[testenv:mypy]
 deps =
-    mypy == 0.902
+    mypy
 commands = mypy freezegun