bump readme version

Author: netbymatt

README.md

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 # nexrad-level-3-data
 
-### v0.2.0
+### v0.3.0
 A javascript implementation for decoding Nexrad Level III radar files.
 
 You can find more information on how radar data is encoded at [NOAA](https://www.roc.noaa.gov/WSR88D/BuildInfo/Files.aspx). The work in this project is based mainly on the document [2620001 ICD FOR THE RPG TO CLASS 1 USER - Build 19.0](https://www.roc.noaa.gov/wsr88d/PublicDocs/ICDs/2620001Y.pdf).