added filter for choose file, restrict to cbr,cbz,cbt only

index.html

@@ -11,7 +11,7 @@
         <div class="se-pre-con"></div> <!-- loading spinner -->
         
         <label>Open comic:</label><br>
-        <input type="file" name="fileup" id="fileup"><br>
+        <input type="file" name="fileup" id="fileup" accept=".cbr,.cbz,.cbt"><br>
         <i>(cbr,cbz,cbt files only)</i>
         <br><br>
         <center>