change test files that do not end in .txt to view via GitHub

1998/schweikh1/index.html

@@ -364,7 +364,7 @@ That describes exactly my modest attempts…</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/schweikh1/schweikh1.orig.c">schweikh1.orig.c</a> - original source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/schweikh1/charcount.pl">charcount.pl</a> - character counter</li>
 <li><a href="macos.html">macos.html</a> - work with macOS</li>
-<li><a href="info">info</a> - standards compliance</li>
+<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1998/schweikh1/info">info</a> - standards compliance</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>