updated README; added alt tag to product image

sommersoft · sommersoft · commit c88c67516456 · 2018-03-16T18:32:55.000-05:00
diff --git a/README.rst b/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
 =============
