update NR contribution.

Author: nickreich

README.md

@@ -185,6 +185,6 @@ Contributors
 
 * [Jeff Leek](http://biostat.jhsph.edu/~jleek/) - Wrote the initial version.
 * [L. Collado-Torres](http://bit.ly/LColladoTorres) - Fixed typos, added links.
-* [Nick Reich](http://people.umass.edu/nick/) - Added .
+* [Nick Reich](http://people.umass.edu/nick/) - Added tips on storing data as text.