Add newer language options.

diff --git a/client/langs.go b/tmp/langs.go
index b09c69f..0695958 100644
--- a/client/langs.go
+++ b/tmp/langs.go
@@ -9,6 +9,7 @@ var Langs = map[string]string{
 	"42": "GNU G++11 5.1.0",
 	"50": "GNU G++14 6.4.0",
 	"54": "GNU G++17 7.3.0",
+	"89": "GNU G++20 13.2 (64 bit, winlibs)",
 	"2":  "Microsoft Visual C++ 2010",
 	"59": "Microsoft Visual C++ 2017",
 	"9":  "C# Mono 5.18",
@@ -60,6 +61,7 @@ var LangsExt = map[string]string{
 	"GNU C++11":             "cpp",
 	"GNU C++14":             "cpp",
 	"GNU C++17":             "cpp",
+	"GNU G++20":             "cpp",
 	"MS C++":                "cpp",
 	"MS C++ 2017":           "cpp",
 	"Mono C#":               "cs",
tion value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=1d70205ad79fc1330de6cad71abbdfc93a52d9d7'>refs</a><a class='active' href='/guix/log/ROADMAP'>log</a><a href='/guix/tree/ROADMAP?id=1d70205ad79fc1330de6cad71abbdfc93a52d9d7'>tree</a><a href='/guix/commit/ROADMAP?id=1d70205ad79fc1330de6cad71abbdfc93a52d9d7'>commit</a><a href='/guix/diff/ROADMAP?id=1d70205ad79fc1330de6cad71abbdfc93a52d9d7'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/ROADMAP'>
<input type='hidden' name='id' value='1d70205ad79fc1330de6cad71abbdfc93a52d9d7'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=1d70205ad79fc1330de6cad71abbdfc93a52d9d7'>root</a>/<a href='/guix/log/ROADMAP?id=1d70205ad79fc1330de6cad71abbdfc93a52d9d7'>ROADMAP</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/ROADMAP?id=1d70205ad79fc1330de6cad71abbdfc93a52d9d7&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-05-20 01:58:04 +0200'>2021-05-20</span></td><td><a href='/guix/commit/ROADMAP?id=c0087d33705f53cc3619a1a43a33602aaecc3a8b'>The #guix channel is hosted by Libera Chat.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>