update changelog with shells page

Author: mattmakai

content/pages/12-meta/01-change-log.markdown

@@ -17,6 +17,7 @@ on GitHub.
 
 ## 2017
 ### October
+* New [shells](/shells.html) starter page.
 * Added blog post version of mid-October email newsletter 
   [PyCon US 2018 CFP, Python Bytes and Pelican](/blog/pycon-us-2018-cfp-python-bytes-pelican.html).
 * New starter page for [Rollbar](/rollbar.html) as part of the hosted