Merge pull request #8 from sommersoft/new_docs

updated README; added alt tag to product image

Author: kattni

README.rst

@@ -38,6 +38,7 @@ datalogging and clocks, or anything where you need to
 really know the time.
 
 .. image:: ../docs/_static/3013-01.jpg
+    :alt: DS3231 Product Image
 
 Dependencies
 =============