Changes in version 1.5.1 (2023-04-28)                  

    o   conv_unit():	fixed bug when inputting geographic coordinates <= 1e-4

                 Changes in version 1.5.0 (2023-02-19)                  

    o   conv_unit():	added torque dimension

    o   conv_unit():	various additional synonyms now supported to support ease of use

                 Changes in version 1.4.0 (2019-05-28)                  

    o   conv_unit():	added file_size dimension

    o   conv_unit():	added synonyms for a number of units

                 Changes in version 1.3.0 (2018-12-09)                  

    o   conv_unit():	added "pmol" and "fmol" as count unit options

    o   conv_unit():	added "Da" (Dalton), "Tg", "Gg", "Mg", ng", "pg", and "fg" as mass unit options

                 Changes in version 1.2.0 (2018-03-21)                  

    o   conv_unit():	added "cmH2O" and "inH2O" as pressure unit options

    o   conv_unit():	added "km_per_hr" and "mi_per_hr" as synonyms for "kph" and "mph", respectively

    o   conv_unit():	fixed an issue where NAs in coordinates caused incorrect conversions

                 Changes in version 1.1.0 (2016-10-29)                  

    o   conv_multiunit(): new function

                 Changes in version 1.0.0 (2016-07-27)                  

    o   conv_dim():	new function

    o   conv_unit():	new function