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version 1.5.1, 2023-04-28
- conv_unit():	fixed bug when inputting geographic coordinates <= 1e-4
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version 1.5.0, 2023-02-19
- conv_unit():	added torque dimension
- conv_unit():	various additional synonyms now supported to support ease of use

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version 1.4.0, 2019-05-27
- conv_unit():	added file_size dimension
- conv_unit():	added synonyms for a number of units

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version 1.3.0, 2018-12-09
- conv_unit():	added "pmol" and "fmol" as count unit options
- conv_unit():	added "Da" (Dalton), "Tg", "Gg", "Mg", ng", "pg", and "fg" as mass unit options

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version 1.2.0, 2018-03-21
- conv_unit():	added "cmH2O" and "inH2O" as pressure unit options
- conv_unit():	added "km_per_hr" and "mi_per_hr" as synonyms for "kph" and "mph", respectively
- conv_unit():	fixed an issue where NAs in coordinates caused incorrect conversions

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version 1.1.0, 2016-10-28
- conv_multiunit(): new function

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version 1.0.0, 2016-07-26
- conv_dim():	new function
- conv_unit():	new function