message: Documentation Correction to use http.server for Python3
diff: @@ -153,7 +153,8 @@ and start a simple web server so we can check out the docs in a browser:
  ```bash
  cd docs/_build/html
  -python -m SimpleHTTPServer
  +python -m http.server # Python2 users should use SimpleHTTPServer
  +
  ```
  This will start a small Python web server listening on port 8000. Point your
  