feat: v8 (#418)

BREAKING CHANGE: Drop support for NodeJS v14, v16

BREAKING CHANGE: remove previews logic for the REST API

.github/workflows/test.yml

@@ -13,9 +13,8 @@ jobs:
     strategy:
       matrix:
         node_version:
-          - 14
-          - 16
           - 18
+          - 20
     steps:
       - uses: actions/checkout@v3
       - name: Test with Node.js ${{ matrix.node_version }}

README.md

@@ -184,17 +184,6 @@ axios(requestOptions);
         Media type param, such as <code>raw</code>, <code>diff</code>, or <code>text+json</code>. See <a href="https://developer.github.com/v3/media/">Media Types</a>. Setting <code>options.mediaType.format</code> will amend the <code>headers.accept</code> value.
       </td>
     </tr>
-    <tr>
-      <th>
-        <code>options.mediaType.previews</code>
-      </th>
-      <td>
-        Array of Strings
-      </td>
-      <td>
-        Name of previews, such as <code>mercy</code>, <code>symmetra</code>, or <code>scarlet-witch</code>. See <a href="https://developer.github.com/v3/previews/">API Previews</a>. If <code>options.mediaType.previews</code> was set as default, the new previews will be merged into the default ones. Setting <code>options.mediaType.previews</code> will amend the <code>headers.accept</code> value. <code>options.mediaType.previews</code> will be merged with an existing array set using <code>.defaults()</code>.
-      </td>
-    </tr>
     <tr>
       <th>
         <code>options.data</code>