Replace Travis with Github Actions

Will build on 3.6 and 3.7, on Linux and Mac. Updates makefile to use
`python` instead of `python3` because Windows is weird. Windows builds
will come later when better support for spawned processes is added.

.github/workflows/build.yml

@@ -0,0 +1,36 @@
+name: Build
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - v*
+  pull_request:
+
+jobs:
+  bowler:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [3.6, 3.7]
+        os: [macOS-latest, ubuntu-latest]
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install
+      run: |
+        python -m pip install --upgrade pip
+        make setup
+        pip install -U .
+    - name: Test
+      run: make test
+    - name: Lint
+      run: make lint
+    - name: Coverage
+      run: codecov --token ${{ secrets.CODECOV_TOKEN }} --branch ${{ github.ref }}
+      continue-on-error: true

makefile

@@ -1,19 +1,19 @@
 venv:
-	python3 -m venv .venv
+	python -m venv .venv
 	@echo 'run `source .venv/bin/activate` to use virtualenv'
 
 setup:
-	python3 -m pip install -Ur requirements.txt
-	python3 -m pip install -Ur requirements-dev.txt
+	python -m pip install -Ur requirements.txt
+	python -m pip install -Ur requirements-dev.txt
 
 dev: venv
 	source .venv/bin/activate && make setup
-	source .venv/bin/activate && python3 setup.py develop
+	source .venv/bin/activate && python setup.py develop
 	@echo 'run `source .venv/bin/activate` to develop bowler'
 
 release: lint test clean
-	python3 setup.py sdist bdist_wheel
-	python3 -m twine upload dist/*
+	python setup.py sdist bdist_wheel
+	python -m twine upload dist/*
 
 format:
 	isort --recursive -y bowler setup.py
@@ -31,8 +31,8 @@ lint:
 	mypy -m bowler
 
 test:
-	python3 -m coverage run -m bowler.tests
-	python3 -m coverage report
+	python -m coverage run -m bowler.tests
+	python -m coverage report
 
 clean:
 	rm -rf build dist README MANIFEST *.egg-info

requirements-dev.txt

@@ -1,4 +1,5 @@
 black
+codecov
 coverage
 isort
 mypy-mypyc