Update README.rst

Add a link to GitHub search for projects using the library
diff --git a/README.rst b/README.rst
index 34d28d4..514e435 100644
--- a/README.rst
+++ b/README.rst
@@ -145,6 +145,8 @@
 
 * `spdlog <https://github.com/gabime/spdlog>`_: Super fast C++ logging library
 
+`More... <https://github.com/search?q=cppformat&type=Code>`_
+
 If you are aware of other projects using this library, please let me know
 by `email <mailto:victor.zverovich@gmail.com>`_ or by submitting an
 `issue <https://github.com/cppformat/cppformat/issues>`_.