update index

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
 ---|---------|-------------
+June 15, 2017 | [Why The GOP Is So Hell-Bent On Passing An Unpopular Health Care Bill](https://fivethirtyeight.com/features/why-the-gop-is-so-hell-bent-on-passing-an-unpopular-health-care-bill) | [ahca-polls](ahca-polls)
 June 7, 2017 | [How Trump’s Least Enthusiastic Voters Feel About Him Now](https://fivethirtyeight.com/features/how-trumps-least-enthusiastic-voters-feel-about-him-now/) | [reluctant-trump](reluctant-trump)
 May 19, 2017 | [The Battle For Riddler Nation, Round 2](http://fivethirtyeight.com/features/the-battle-for-riddler-nation-round-2/) | [riddler-castles](riddler-castles)
 April 27, 2017 | [Trump Might Be The First President To Scrap A National Monument](http://fivethirtyeight.com/features/trump-might-be-the-first-president-to-scrap-a-national-monument/) | [antiquities-act](antiquities-act)