chore: remove unsupported Node.js version from GitHub workflow

Author: webdiscus

.github/workflows/test.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Set up Node.js 18
         uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 20
 
       - name: Install dependencies
         run: |
@@ -46,8 +46,8 @@ jobs:
     strategy:
       fail-fast: false # doesn't stop on first failure
       matrix:
-        os: [ubuntu-latest, windows-latest]
-        node-version: [18, 20, 22]
+        os: [ubuntu-latest]
+        node-version: [20, 22]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repository

README.md

@@ -1,7 +1,7 @@
 [![npm](https://img.shields.io/npm/v/flaget?logo=npm&color=brightgreen "npm package")](https://www.npmjs.com/package/ansis "download npm package")
 [![node](https://img.shields.io/node/v/flaget)](https://nodejs.org)
 [![Test](https://github.com/webdiscus/flaget/actions/workflows/test.yml/badge.svg)](https://github.com/webdiscus/flaget/actions/workflows/test.yml)
-[![codecov](https://codecov.io/gh/webdiscus/flaget/branch/master/graph/badge.svg?token=H7SFJONX1X)](https://codecov.io/gh/webdiscus/flaget)
+[![codecov](https://codecov.io/gh/webdiscus/flaget/graph/badge.svg?token=ETZKAUG7D3)](https://codecov.io/gh/webdiscus/flaget)
 [![install size](https://packagephobia.com/badge?p=flaget)](https://packagephobia.com/result?p=flaget)
 
 <h1 align="center">