message: Update python representations module contributors
diff: }
  @incollection{gudhi:PersistenceRepresentationsScikitlearnInterface
  -, author = "Mathieu Carri\`ere"
  +, author = "Mathieu Carri\`ere, Gard Spreemann, Wojciech Reise"
  , title = "Persistence representations scikit-learn like interface"
  , publisher = "{GUDHI Editorial Board}"
  , edition = "{@GUDHI_VERSION@}"
  