pin dhrun

pkgs/dhrun/pin.json

 {
   "url": "https://github.com/freuk/dhrun.git",
-  "rev": "d776a6f9da9ccaf840f195c38dccb3c60389aca0",
-  "date": "2019-05-16T10:19:10-05:00",
-  "sha256": "0sm5s1nz7n81r6zy7b7k4nkf3pz8rsnw7q8z54sdrx3xvcs4xp91",
+  "rev": "ee23c71671764f256ee18b93f38b8c30c1b7e8d9",
+  "date": "2019-05-16T10:29:18-05:00",
+  "sha256": "1rswbl8a42i2z4zpx82zi4v2j02mpmw3dlm27xkmw9xz4andqxpb",
   "fetchSubmodules": false
 }