message: use python3 to install riot webserver
diff: @@ -12,7 +12,7 @@ cd $BASE_DIR
  # Install ComplexHttpServer (a drop in replacement for Python's SimpleHttpServer
  # but with support for multiple threads) into a virtualenv.
  (
  - virtualenv env
  + virtualenv -p python3 env
  source env/bin/activate
  # Having been bitten by pip SSL fail too many times, I don't trust the existing pip
  