censusapi v0.7.0

• Adds show_call option to getCensus(), which shows the underlying API call (otherwise only shown on errors) and link to package documentation when used.
• Converts improperly formatted string “N/A” and “NULL” values from underlying Census data to true NA values.
• Improves parsing of columns as numeric or character, specifically:
  • Keeps 2017 NAICS variables as characters, instead of erroneously converting to numeric.
  • Parses endpoint numeric variables with all-character variable names as numeric for several popular endpoints: SAHIE, SAIPE, ZBP, CBP, PEP and Decennial Response Rates.
• Removes examples from deprecated 1990 and 2000 Decennial endpoints.