Update README. [ci skip]

README.rst

@@ -27,7 +27,6 @@ or download .zip, extract it. Put 'piexif' directory into your environment.
 Why Choose Piexif
 -----------------
 
-- OS independent
 - Pure Python. So, runs on Python 2.7, 3.3, 3.4, 3.5 and...
 - Easy exif manipulations. Read, write, remove...
 - Documented. http://piexif.readthedocs.org/en/latest/
@@ -87,4 +86,4 @@ This software is released under the MIT License, see LICENSE.txt.
 .. |docs| image:: https://readthedocs.org/projects/piexif/badge/?version=latest
    :target: https://readthedocs.org/projects/piexif/
 .. |Windows Build| image:: https://img.shields.io/appveyor/ci/hmatoba/piexif.svg?label=Windows%20build
-   :target: https://ci.appveyor.com/project/hMatoba/piexif
+   :target: https://ci.appveyor.com/project/hMatoba/piexif