Improve the D wrapper details.

Change-Id: I2715fe80604b8d7d1c0f4e983cd101f22f5a4a57
Reviewed-on: https://code-review.googlesource.com/c/re2/+/59152
Reviewed-by: Paul Wankadia <junyer@google.com>
diff --git a/README b/README
index 23a9c3a..caee6af 100644
--- a/README
+++ b/README
@@ -31,7 +31,7 @@
 and on PyPI (https://pypi.org/project/google-re2/).
 
 A C wrapper is at https://github.com/marcomaggi/cre2/.
-A D wrapper is at https://github.com/ShigekiKarita/re2d.
+A D wrapper is at https://github.com/ShigekiKarita/re2d/ and on DUB (code.dlang.org).
 An Erlang wrapper is at https://github.com/dukesoferl/re2/ and on Hex (hex.pm).
 An Inferno wrapper is at https://github.com/powerman/inferno-re2/.
 A Node.js wrapper is at https://github.com/uhop/node-re2/ and on NPM (npmjs.com).