Add Mjumbe Poe to the list of contributors

README.rst

@@ -139,4 +139,5 @@ Maintainers/contributors:
 * Arien Tolner - https://github.com/Bounder
 * Kevin Brown - https://github.com/kevin-brown
 * Martin Cavoj - https://github.com/macav
+* Mjumbe Poe - https://github.com/mjumbewu