update README

README.md

@@ -4,6 +4,7 @@ We hope you'll use it to check our work and to create stories and visualizations
 
 Article Date(s) | Headline(s) | Folder
 ---|---------|-------------
+April 20, 2015 | [Where People Go To Check The Weather](http://fivethirtyeight.com/datalab/weather-forecast-news-app-habits/) | `weather-check`
 March 15, 2015 | [FiveThirtyEight’s 2015 NCAA Tournament Predictions](http://fivethirtyeight.com/interactives/march-madness-predictions-2015/#mens) | `march-madness-predictions-2015`
 Feb. 18, 2015 | [Every NBA Team’s Chance Of Winning In Every Minute Across Every Game](https://fivethirtyeight.com/features/every-nba-teams-chance-of-winning-in-every-minute-across-every-game/) | `nba-winprobs`
 Jan. 30, 2015 | [Who Will Run For President: Romney Is Out](http://fivethirtyeight.com/datalab/romney-not-running-for-president) | `potential-candidates`