TST: Add testing to github action

.github/workflows/testing.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: Testing
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push:
+  pull_request:
+    branches:
+      - master
+  schedule:
+    - cron: "* * 1,15 * *"
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8]
+        os: [macos-10.15, ubuntu-latest, windows-latest]
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    # Runs a single command using the runners shell
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install -r requirements/test.txt
+    - name: Install package
+      run: |
+        python -m pip install -e .
+    - name: Test with pytest
+      run: |
+        python -m pytest

requirements/test.txt

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+coverage
+flake8
+pytest
+pytest-flake8
+dask
+numpy
+scipy
+scikit-image
+pims
+slicerator