chore: switch to GitHub actions (#6)

Author: nfischer

.gitattributes

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+* text eol=lf

.github/ISSUE_TEMPLATE.md

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+### Node version (or tell us if you're using electron or some other framework):
+
+### ShellJS version (the most recent version/GitHub branch you see the bug on):
+
+### Operating system:
+
+### Description of the bug:
+
+### Example ShellJS command to reproduce the error:
+
+```javascript
+
+```

.github/SECURITY.md

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+# Security Policy
+
+Thank you for reaching out about security! Please note that this project is
+maintained on a best-effort basis, however I still intend to prioritize
+reviewing and addressing security issues.
+
+## Supported Versions
+
+I generally only support the latest release (see
+https://www.npmjs.com/package/shelljs-plugin-open). My goal is to release
+security fixes as patch releases on top of whatever was most recently shipped.
+
+## Reporting a Vulnerability
+
+Please report security vulnerabilities to ntfschr@gmail.com. I should respond
+within a few days. Although it's not strictly required, it helps me out if you
+can include any proof of concept exploit code, suggested fix, etc.
+
+**Please do not publicly disclose the suspected vulnerability** until I have a
+chance to review your report. I'd like a chance to patch the code before the
+issue is known to the public.
+
+Please **only** use this email for security issues. It's also OK to use the
+email if you're legitimately unsure if this is a security issue (better safe
+than sorry). But for all other non-security issues, please use the GitHub issue
+tracker.

.github/workflows/main.yml

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+name: CI
+on:
+  - push
+  - pull_request
+jobs:
+  test:
+    name: Node.js ${{ matrix.node-version }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version:
+          - 4
+          - 6
+          - 8
+          - 10
+          - 12
+          - 14
+          - 16
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - run: npm run test

.travis.yml

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 # shelljs-plugin-open
 
-[![Travis](https://img.shields.io/travis/shelljs/plugin-open/master.svg?style=flat-square&label=unix)](https://travis-ci.org/shelljs/plugin-open)
-[![AppVeyor](https://img.shields.io/appveyor/ci/shelljs/plugin-open/master.svg?style=flat-square&label=windows)](https://ci.appveyor.com/project/shelljs/plugin-open/branch/master)
+[![Build Status](https://img.shields.io/endpoint.svg?url=https%3A%2F%2Factions-badge.atrox.dev%2Fshelljs%2Fplugin-open%2Fbadge%3Fref%3Dmaster&style=flat-square)](https://actions-badge.atrox.dev/shelljs/plugin-open/goto?ref=master)
 [![npm](https://img.shields.io/npm/v/shelljs-plugin-open.svg?style=flat-square)](https://www.npmjs.com/package/shelljs-plugin-open)
 [![shelljs-plugin](https://img.shields.io/badge/shelljs-plugin-brightgreen.svg?style=flat-square)](https://github.com/shelljs/shelljs/wiki/Using-ShellJS-Plugins)