haven 0.2.0

zap_labels() now leaves unlabelled vectors unchanged, making it easier
to apply to all columns.
write_dta() and write_sav() take more care to always write output as
UTF-8 (#36)
write_dta() and write_sav() won't crash if you give them invalid paths,
and you can now use ~ to refer to your home directory (#37).
Byte variables are now correctly read into integers (not strings, #45),
and missing values are captured correctly (#43).
Added read_stata() as alias to read_dta() (#52).
read_spss() uses extension to automatically choose between read_sav()
and read_por() (#53)
Updates from ReadStat. Including fixes for various parsing bugs, more
encodings, and better support for large files.
hms objects deal better with missings when printing.
Fixed bug causing labels for numeric variables to be read in as
integers and associated error: Error: xandlabels must be same type

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