updated close logic and readme

Author: kootenpv

Diff for: README.md

@@ -22,7 +22,7 @@ contents = ['This is the body, and here is just text http://somedomain/image.png
 yag.send('[email protected]', 'subject', contents)
 ```
 
-Or a simple one-liner (connection will automatically close):
+Or a simple one-liner:
 ```python
 yagmail.SMTP('mygmailusername').send('[email protected]', 'subject', 'This is the body')
 ```
@@ -87,7 +87,10 @@ Another convenience can be to save a .yagmail file in your home folder, containi
 yag = yagmail.SMTP('mygmailusername')
 ```
 
-Note that this connection is reusable, closable and when it leaves scope it will clean up after itself.
+Note that this connection is reusable, closable and when it leaves scope it will **clean up after itself in CPython**.
+
+As [tilgovi](https://github.com/tilgovi) points out in [#39](https://github.com/kootenpv/yagmail/issues/39), SMTP does not automatically close in **PyPy**. The context manager `with` should be used in that case.
+
 
 ### Usability
 

Diff for: setup.py

@@ -2,7 +2,7 @@
 
 MAJOR_VERSION = '0'
 MINOR_VERSION = '5'
-MICRO_VERSION = '135'
+MICRO_VERSION = '136'
 VERSION = "{}.{}.{}".format(MAJOR_VERSION, MINOR_VERSION, MICRO_VERSION)
 
 from setuptools.command.test import test as TestCommand

Diff for: yagmail/__init__.py

@@ -1,5 +1,5 @@
 __project__ = 'yagmail'
-__version__ = "0.5.135"
+__version__ = "0.5.136"
 
 from .error import YagConnectionClosed
 from .error import YagAddressError

Diff for: yagmail/yagmail.py

@@ -70,6 +70,7 @@ def __enter__(self):
         return self
 
     def __exit__(self, exc_type, exc_val, exc_tb):
+        self.close()
         return False
 
     def set_logging(self, log_level=logging.ERROR, file_path_name=None):
@@ -383,6 +384,9 @@ def feedback(self, message="Awesome features! You made my day! How can I contrib
         """ Most important function. Please send me feedback :-) """
         self.send('[email protected]', 'Yagmail feedback', message)
 
+    def __del__(self):
+        self.close()
+
 
 class SMTP_SSL(SMTP):