Update readme

Fixes #551

Readme.md

@@ -30,8 +30,10 @@ The following table lists all available download options:
     <tr>
       <td><b>GUI</b></td>
       <td>
-        <div>🟢 <b><a href="https://github.com/Tyrrrz/DiscordChatExporter/releases/latest">Stable release</a></b> (<code>DiscordChatExporter.zip</code>)</div>
-        <div>🟠 <a href="https://github.com/Tyrrrz/DiscordChatExporter/actions?query=workflow%3ACI">CI build</a> (<code>DiscordChatExporter.zip</code>)</div>
+        <ul>
+          <li>🟢 <b><a href="https://github.com/Tyrrrz/DiscordChatExporter/releases/latest">Stable release</a></b> (<code>DiscordChatExporter.zip</code>)</li>
+          <li>🟠 <a href="https://github.com/Tyrrrz/DiscordChatExporter/actions?query=workflow%3ACI">CI build</a> (<code>DiscordChatExporter.zip</code>)</li>
+        </ul>
       </td>
       <td>
         <ul>
@@ -49,15 +51,17 @@ The following table lists all available download options:
     <tr>
       <td><b>CLI</b></td>
       <td>
-        <div>🟢 <b><a href="https://github.com/Tyrrrz/DiscordChatExporter/releases/latest">Stable release</a></b> (<code>DiscordChatExporter.CLI.zip</code>)</div>
-        <div>🟠 <a href="https://github.com/Tyrrrz/DiscordChatExporter/actions?query=workflow%3ACI">CI build</a> (<code>DiscordChatExporter.CLI.zip</code>)</div>
-        <div>🐋 <a href="https://hub.docker.com/r/tyrrrz/discordchatexporter">Docker</a> (<code>tyrrrz/discordchatexporter</code>) 🚀</div>
-        <div>📦 <a href="https://aur.archlinux.org/packages/discord-chat-exporter-cli">AUR</a> (<code>discord-chat-exporter-cli</code>) 🚀 🦄</div>
+        <ul>
+          <li>🟢 <b><a href="https://github.com/Tyrrrz/DiscordChatExporter/releases/latest">Stable release</a></b> (<code>DiscordChatExporter.CLI.zip</code>)</li>
+          <li>🟠 <a href="https://github.com/Tyrrrz/DiscordChatExporter/actions?query=workflow%3ACI">CI build</a> (<code>DiscordChatExporter.CLI.zip</code>)</li>
+          <li>🐋 <a href="https://hub.docker.com/r/tyrrrz/discordchatexporter">Docker</a> (<code>tyrrrz/discordchatexporter</code>) 🚀</li>
+          <li>📦 <a href="https://aur.archlinux.org/packages/discord-chat-exporter-cli">AUR</a> (<code>discord-chat-exporter-cli</code>) 🚀 🦄</li>
+        </ul>
       </td>
       <td>
         <ul>
-          <li>Windows <b>7</b>+</li>
-          <li>macOS <b>10.11</b>+</li>
+          <li>Windows <b>7</b> or higher</li>
+          <li>macOS <b>10.13 (High Sierra)</b> or higher</li>
           <li>Linux</li>
         </ul>
       </td>