Merge pull request #270 from sTywin/readme-node-and-date

Add `node-and-timestamp` to README.rst

Author: RonnyPfannschmidt

README.rst

@@ -272,6 +272,8 @@ Version number construction
 
     :node-and-date: adds the node on dev versions and the date on dirty
                     workdir (default)
+    :node-and-timestamp: like :code:`node-and-date` but with a timestamp of
+                         the form :code:`{:%Y%m%d%H%M%S}` instead
     :dirty-tag: adds :code:`+dirty` if the current workdir has changes