Add Roozbeh to AUTHORS

He's been my shadow for all Indic-related changes in the last
few months.
diff --git a/AUTHORS b/AUTHORS
index c611d7d..81cdc4c 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -4,5 +4,6 @@
 Jonathan Kew
 Lars Knoll
 Werner Lemberg
+Roozbeh Pournader
 Owen Taylor
 David Turner