readme: update the README and CONTRIBUTING files

- Fixed some URLs.
- Added the PyPI version and Python version badges to the README file.

Signed-off-by: Diego Escalona <diego.escalona@digi.com>

Author: diescalo

CONTRIBUTING.rst

@@ -13,15 +13,15 @@ Reporting a bug
 ---------------
 
 The way to report bugs is to use the
-`GitHub issue tracker <http://github.com/digidotcom/python-xbee/issues>`_.
+`GitHub issue tracker <http://github.com/digidotcom/xbee-python/issues>`_.
 Before reporting a bug, please read the following points:
 
 #. Make sure that what you are seeing is really a bug by checking the
    `documentation <https://xbplib.readthedocs.io/en/latest>`_ and consulting 
    the `FAQs <https://xbplib.readthedocs.io/en/latest/faq.html>`_ section.
 #. If you still think you have found a bug, make sure someone has not already
    reported it. See the list of
-   `known issues <http://github.com/digidotcom/python-xbee/issues>`_.
+   `known issues <http://github.com/digidotcom/xbee-python/issues>`_.
 #. If it has not been reported yet, create a new issue. Make sure to add enough
    detail so that the bug can be reproduced.
 
@@ -38,14 +38,14 @@ Suggesting a new feature
    section to ensure that the behavior you would like the library to have is 
    not excluded.
 #. Make sure someone has not already requested it. See the list of
-   `known issues <http://github.com/digidotcom/python-xbee/issues>`_.
+   `known issues <http://github.com/digidotcom/xbee-python/issues>`_.
 #. Submit your request in the issue tracker.
 
 
 Contributing code
 -----------------
 
-#. Fork the `XBee Python library <http://github.com/digidotcom/python-xbee>`_
+#. Fork the `XBee Python library <http://github.com/digidotcom/xbee-python>`_
    repository (`how to fork a repo
    <https://help.github.com/articles/fork-a-repo/>`_).
 #. Create a branch for your contribution. Use a name that defines the purpose

README.rst

@@ -1,5 +1,5 @@
-Digi XBee Python library
-========================
+Digi XBee Python library |pypiversion| |pythonversion|
+======================================================
 
 This project contains the source code of the XBee Python library, an
 easy-to-use API developed in Python that allows you to interact with Digi
@@ -42,16 +42,21 @@ How to contribute
 -----------------
 
 The contributing guidelines are in the `CONTRIBUTING.rst document
-<https://github.com/digidotcom/python-xbee/blob/master/CONTRIBUTING.rst>`_.
+<https://github.com/digidotcom/xbee-python/blob/master/CONTRIBUTING.rst>`_.
 
 
 License
 -------
 
-Copyright 2017, Digi International Inc.
+Copyright 2017-2019, Digi International Inc.
 
-The `MPL 2.0 license <https://github.com/digidotcom/python-xbee/blob/master/LICENSE.txt>`_
+The `MPL 2.0 license <https://github.com/digidotcom/xbee-python/blob/master/LICENSE.txt>`_
 covers the majority of this project with the following exceptions:
 
-* The `ISC license <https://github.com/digidotcom/python-xbee/blob/master/examples/LICENSE.txt>`_
+* The `ISC license <https://github.com/digidotcom/xbee-python/blob/master/examples/LICENSE.txt>`_
   covers the contents of the examples directory.
+
+.. |pypiversion| image:: https://badge.fury.io/py/digi-xbee.svg
+    :target: https://pypi.org/project/digi-xbee/
+.. |pythonversion| image:: https://img.shields.io/pypi/pyversions/digi-xbee.svg
+    :alt: PyPI - Python Version