Fixed configuration file test - release call was missing.

Once again, __del__ is not being called as usual anymore in python 3 ... .

Author: Byron

git/test/test_config.py

@@ -73,6 +73,7 @@ def test_read_write(self):
             assert r_config.has_section(sname)
             assert r_config.has_option(sname, oname)
             assert r_config.get(sname, oname) == val
+            w_config.release()
         # END for each filename
 
     def test_multi_line_config(self):