build!: drop support for node 16 (#575)

BREAKING CHANGE: This module now requires node.js 18 and up. It includes a variety of related changes:
- Migrate from gts to xo for linting and code formatting
- Upgrade multiple deps to the latest version that were blocked on node 16
- Drop the codecov dependency and move to the github action
- Update the tsconfig to target Node16 for the module strategy

It's entirely possible this change didn't break anything for most users, but it's also possible it did.

.github/workflows/ci.yaml

@@ -6,14 +6,14 @@ on:
 name: ci
 env:
   FORCE_COLOR: 2
-  NODE: 18
+  NODE: 20
 jobs:
   test:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        node: [16, 18, 20]
+        node: [18, 20]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
@@ -23,8 +23,12 @@ jobs:
       - run: node -v
       - run: npm ci
       - run: npm test
-      - run: npm run codecov
-        if: matrix.node == env.NODE
+      - run: npm run coverage
+        if: matrix.node == env.node
+      - uses: codecov/codecov-action@v3
+        if: matrix.node == env.node
+        with:
+          fail_ci_if_error: false
   windows:
     runs-on: windows-latest
     steps:

README.md

@@ -3,10 +3,8 @@
 > A super simple site crawler and broken link checker.
 
 [![npm version](https://img.shields.io/npm/v/linkinator)](https://www.npmjs.org/package/linkinator)
-[![Build Status](https://img.shields.io/github/workflow/status/JustinBeckwith/linkinator/ci/main)](https://github.com/JustinBeckwith/linkinator/actions?query=branch%3Amain+workflow%3Aci)
 [![codecov](https://img.shields.io/codecov/c/github/JustinBeckwith/linkinator/main)](https://app.codecov.io/gh/JustinBeckwith/linkinator)
-[![Known Vulnerabilities](https://img.shields.io/snyk/vulnerabilities/github/JustinBeckwith/linkinator)](https://snyk.io/test/github/JustinBeckwith/linkinator)
-[![Code Style: Google](https://img.shields.io/badge/code%20style-google-blueviolet)](https://github.com/google/gts)
+[![XO code style](https://shields.io/badge/code_style-5ed9c7?logo=xo&labelColor=gray)](https://github.com/xojs/xo)
 [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079)](https://github.com/semantic-release/semantic-release)