Remove Travis CI (#32)

* Remove travis and port to github actions

Removes travis-ci and ports all workflows to github actions, so code coverage is now merged with testing.

* Change workflow name to build

* Update status badge on `README.md`

.github/workflows/test.yml

@@ -0,0 +1,33 @@
+name: Build
+
+on: [push, pull_request]
+jobs:
+  test:
+    name: "Test on Python ${{ matrix.python_version }}"
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8, 3.9]
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: Setup Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install
+        run: |
+          pip install pytest
+          pip install coverage
+          pip install codecov
+          pip install -r requirements.txt
+      - name: Test
+        run: |
+          coverage run -m pytest
+      - name: Generate Coverage Report
+        run: |
+          python -m coverage report
+          python -m coverage xml
+      - name: Upload to codecov
+        run: |
+          codecov

README.md

@@ -1,6 +1,6 @@
 ![DiffPriv Logo](https://docs.google.com/drawings/d/e/2PACX-1vQ8A92uJpy4g09GFYxayNQXOvtl0wmXXkYFiteDFSaXVcfdbcm835wc_IjjlKHlM94rjdsM7H1Szzjq/pub?w=600)
 
-[![Build Status](https://www.travis-ci.com/Quantalabs/DiffPriv.svg?branch=master)](https://www.travis-ci.com/Quantalabs/DiffPriv)
+[![GitHub Workflow Status](https://img.shields.io/github/workflow/status/Quantalabs/DiffPriv/Build?style=flat-square)](https://github.com/actions/workflows/test.yml)
 [![PyPI Version](https://shields.mitmproxy.org/pypi/v/DIffPriv.svg)](https://pypi.org/project/DiffPriv)
 [![DeepSource](https://deepsource.io/gh/Quantalabs/DiffPriv.svg/?label=active+issues&show_trend=true)](https://deepsource.io/gh/Quantalabs/DiffPriv/?ref=repository-badge)
 [![codecov](https://codecov.io/gh/Quantalabs/DiffPriv/branch/master/graph/badge.svg?token=wCz4qTJxEO)](https://codecov.io/gh/Quantalabs/DiffPriv)