Minor spacing tidying

chapter_14/README.md

@@ -8,7 +8,6 @@ This file consists of GeoJSON data generated by Mike Bostock from U.S. Census da
 
 
 
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 ### us-ag-productivity.csv
 
 This file consists of data provided by the USDA, and is in the public domain. The values report agricultural productivity, by state, for 2004. Values are relative to an arbitrary baseline of the productivity of the state of Alabama in 1996 (1.0).
@@ -33,5 +32,3 @@ Release Date: May 2016
 https://www.census.gov/data/tables/2015/demo/popest/total-cities-and-towns.html
 
 
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