Add a way to sniff for HLS playlist files (m3u8)

Author: padenot

mimesniff.bs

@@ -1057,6 +1057,23 @@ algorithm</dfn>:
        The string "<code>OggS</code>" followed by NUL, the Ogg container
        signature.
 
+     <tr>
+      <td>
+       23 45 58 54 4d 33 55
+
+      <td>
+       FF FF FF FF FF FF FF
+
+      <td>
+       None.
+
+      <td>
+       <code>application/vnd.apple.mpegurl<code>
+
+      <td>
+       The string "<code>EXTM3U</code>", the tag that always
+       starts an Extended M3U playlist file.
+
 
      <!-- https://hostr.co/LJUEw0K -->
      <tr>