v0.0-5

• Remove parameter municipalityIds to swcGetMutations()
• Improve computation of fitness to properly include abolished communes
• Adapt swcReadData() to new data format

v0.0-4

• New function swcGetMapping() that computes a mapping between two lists
  of municipality IDs, with runnable example
• New datasets SwissBirths and SwissPop
• New function swcGetMutations() that computes a list of municipality
  mutations from a list of municipality states
• New function swcCheckData() that checks the commune data for consistency

v0.0-3

• New function swcGetData() that reads commune data from
  the web only once and reuses cached results for forthcoming calls
• Rename function read_historicized_commune_data() to swcReadData()

v0.0-2

• New function read_historicized_commune_data() to download and import
  historicized commune data from the BfS server