socialmixr 0.4.0

• The speed of loading surveys has been increased.
• An error has been fixed causing NA contact matrices if any 5-year age band in the population data was missing.
• Results of function calls accessing Zenodo repository are now cached for speedup and to avoid multiple web requests
• A bug was fixed where ages given as ranges had been set to the average of estimated ones
• The limits_to_agegroups has been changed to return bracket notated age ranges by default