Create GitHub action to run tests (#296)

* Create GitHub Action
* Remove travis yml to move to github actions.
* Update CI badge in README

.github/workflows/blank.yml

@@ -0,0 +1,33 @@
+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+# 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: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    - uses: actions/checkout@v2
+
+    - name: make dist
+      run: make dist
+
+    - name: make install
+      run: make dist
+
+    - name: make test
+      run: make test
+

.travis.yml

@@ -1,6 +0,0 @@
-# Note: "shell" would be more appropriate
-language: python
-
-install: make dist && sudo make install
-
-script: make test

README.md

@@ -2,7 +2,7 @@
 
 > A simple and extensible shell script for managing your todo.txt file.
 
-[![Build Status](https://travis-ci.org/todotxt/todo.txt-cli.svg?branch=master)](https://travis-ci.org/todotxt/todo.txt-cli)
+![CI](https://github.com/todotxt/todo.txt-cli/workflows/CI/badge.svg)
 [![GitHub issues](https://img.shields.io/github/issues/todotxt/todo.txt-cli.svg)](https://github.com/todotxt/todo.txt-cli/issues) 
 [![GitHub forks](https://img.shields.io/github/forks/todotxt/todo.txt-cli.svg)](https://github.com/todotxt/todo.txt-cli/network)
 [![GitHub stars](https://img.shields.io/github/stars/todotxt/todo.txt-cli.svg)](https://github.com/todotxt/todo.txt-cli/stargazers)