Added example of logging

Author: Zhen

README.rst

@@ -30,6 +30,18 @@ Quick Example
         session.write_transaction(add_friends, "Arthur", "Merlin")
         session.read_transaction(print_friends, "Arthur")
 
+Logging
+=============
+The driver provides a built-in logging. The following example code enables debug logging and prints out logs at stdout:
+
+.. code-block:: python
+
+    from neo4j.util import watch
+    import logging
+    from sys import stdout
+
+    watch("neo4j.bolt", logging.DEBUG, stdout)
+
 
 Installation
 ============

neo4j/bolt/connection.py

@@ -516,7 +516,6 @@ def close(self):
                     for address in list(self.connections):
                         self.remove(address)
         except TypeError as e:
-            print(e)
             pass
 
     def closed(self):