Pick another host for unit tests

heise.de seems too often run into to timeouts when doing
this unit test. Thus it is being changed to web.de, hoping
it works better.

Author: drwetter

t/32_isHTML_valid.t

@@ -10,7 +10,7 @@ use Text::Diff;
 
 my $tests = 0;
 my $prg="./testssl.sh";
-my $uri="heise.de";
+my $uri="web.de";
 my $out="";
 my $html="";
 my $debughtml="";