Action tweaks

- Add nodejs 20.x test
- Remove travis [they failed the open source community]
- Add badge

.github/workflows/build.yml

@@ -1,4 +1,4 @@
-name: Build and test on supported platforms
+name: Build & Test
 
 on: [push, pull_request]
 
@@ -7,8 +7,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        node-version: [16.x, 18.x]
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        node-version: [ 16.x, 18.x, 20.x ]
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
       fail-fast: false
     steps:
       - uses: actions/checkout@v3
@@ -39,7 +39,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [16, 18]
+        node-version: [ 16, 18, 20 ]
     container: node:${{ matrix.node-version }}-alpine3.18
     steps:
       - uses: actions/checkout@v3

README.md

@@ -1,6 +1,6 @@
 [![npm version](https://badgen.now.sh/npm/v/isolated-vm)](https://www.npmjs.com/package/isolated-vm)
 [![isc license](https://badgen.now.sh/npm/license/isolated-vm)](https://github.com/laverdet/isolated-vm/blob/main/LICENSE)
-[![travis build](https://badgen.now.sh/travis/laverdet/isolated-vm/main)](https://app.travis-ci.com/github/laverdet/isolated-vm)
+[![github action](https://github.com/laverdet/isolated-vm/actions/workflows/build.yml/badge.svg)](https://github.com/laverdet/isolated-vm/actions/workflows/build.yml)
 [![npm downloads](https://badgen.now.sh/npm/dm/isolated-vm)](https://www.npmjs.com/package/isolated-vm)
 
 isolated-vm -- Access to multiple isolates in nodejs