add GitHub mirror info.

Author: ttdoda

README

@@ -2,7 +2,8 @@
 
   Documentation of lv is provided on the web. See the following URL:
 
-    http://www.ff.iij4u.or.jp/~nrt/lv/
+    http://www.ff.iij4u.or.jp/~nrt/lv/ (not available)
+    https://github.com/ttdoda/lv (Mirror on GitHub)
 
 ------------------------------------------------------------------------------
 
@@ -37,5 +38,8 @@ INSTALLATION:
 
 ------------------------------------------------------------------------------
 NARITA Tomio
-email: [email protected]
-Homepage: http://www.ff.iij4u.or.jp/~nrt/
+email: nrt _at_ ff.iij4u.or.jp
+Homepage: http://www.ff.iij4u.or.jp/~nrt/ (not available)
+
+GitHub mirror: https://github.com/ttdoda/lv
+Maintiainer of GitHub mirror: IWAMOTO Kouichi (sue _at_ iwmt.org)