Upgrade to pylint==1.7.2

Also added PyPi badge to readme

README.rst

@@ -1,4 +1,4 @@
-blinkpy |Build Status| |Coverage Status|
+blinkpy |Build Status| |Coverage Status| |PyPi Version|
 =============================================
 A Python library for the Blink Camera system
 
@@ -13,9 +13,19 @@ Original protocol hacking by MattTW : https://github.com/MattTW/BlinkMonitorProt
 
 API calls faster than 60 seconds is not recommended as it can overwhelm Blink's servers.  Please use this module responsibly.
 
-Installation
-================
-``pip3 install blinkpy``
+Installing Development Version
+==================================
+To install the current development version, perform the following steps.  Note that the following will create a blinkpy directory in your home area:
+
+.. code:: bash
+
+    $ cd ~
+    $ git clone https://github.com/fronzbot/blinkpy.git
+    $ cd blinkpy
+    $ rm -rf build dist
+    $ python setup.py bdist_wheel
+    $ pip3 install --upgrade dist/*.whl
+
 
 Purpose
 ===========
@@ -122,3 +132,5 @@ The ``BlinkURLHandler`` class expects to be initialized with the region id found
    :target: https://travis-ci.org/fronzbot/blinkpy
 .. |Coverage Status| image:: https://coveralls.io/repos/github/fronzbot/blinkpy/badge.svg?branch=master
     :target: https://coveralls.io/github/fronzbot/blinkpy?branch=master
+.. |PyPi Version| image:: https://badge.fury.io/py/blinkpy.svg
+    :target: https://badge.fury.io/py/blinkpy

requirements_test.txt

@@ -1,10 +1,10 @@
 flake8==3.3
 flake8-docstrings==1.1.0
-pylint==1.7.1
+pylint==1.7.2
 pydocstyle==2.0.0
 pytest>=2.9.2
 pytest-cov>=2.3.1
 pytest-sugar>=0.8.0
 pytest-timeout>=1.0.0
 restructuredtext-lint>=1.0.1
-pygments>=2.2.0
+pygments>=2.2.0