Merge pull request #869 from mloskot/patch-1

Add nanodbc library to Catch users

docs/opensource-users.md

@@ -34,6 +34,9 @@ A, single-header, JSON parsing library that takes advantage of what C++ has to o
 ### [MNMLSTC Core](https://github.com/mnmlstc/core)
 a small and easy to use C++11 library that adds a functionality set that will be available in C++14 and later, as well as some useful additions
 
+### [nanodbc](https://github.com/lexicalunit/nanodbc/)
+A small C++ library wrapper for the native C ODBC API.
+
 ### [SOCI](https://github.com/SOCI/soci)
 The C++ Database Access Library