bcdata 0.5.0

• Make functions more robust to non-functioning WMS/WFS GetCapabilities requests
  (#339, #341).
• dbplyr 2.5.0 has made the requirement for using !! or local() for local
  functions more restrictive; updated tests and examples (#341).
• Deprecate the bcdata.single_download_limit option, as it was mostly
  redundant with bcdata.chunk_limit, and should always be set by the server.
  Please set the page size limit for paginated requests via the
  bcdata.chunk_limit option (#332).
• Updated internals to adapt to changes in B.C. Data Catalogue (#342, #343).