Update curated.md

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Author: isvaldo

curated.md

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 - [data.table cheat sheet](https://s3.amazonaws.com/assets.datacamp.com/img/blog/data+table+cheat+sheet.pdf)
 - [Exploratory Data Analysis with data.table](http://varianceexplained.org/RData/lessons/lesson4/)
 - [Fast summary statistics in R with data.table](http://blog.yhathq.com/posts/fast-summary-statistics-with-data-dot-table.html)
-- [R online in r-fiddle.org] (http://www.r-fiddle.org/)
+- [R online in r-fiddle.org](http://www.r-fiddle.org/)
+
 ### Probability and Statistics
 
 - [Probability and Statistics Cookbook](http://matthias.vallentin.net/probability-and-statistics-cookbook/)