Update README.md

trulia · Mar 30, 2014 · 443ecfb · 443ecfb
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 `choroplethr` provides native support for viewing data from the US Census's [American Community Survey (ACS)](https://www.census.gov/acs/www/).  
 
+`choropleth` also supports animating choropleths, which is useful for seeing trends in regions over time, such as population changes.
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 The `choroplethr` package is described more fully in the [wiki](https://github.com/trulia/choroplethr/wiki).
 
 ## Installation