fix link

https://www.reddit.com/r/rust/comments/6o1pnr/the_2017_rust_conference_lineup/dkdwrxx/

Author: steveklabnik

_posts/2017-07-18-conf-lineup.md

@@ -28,7 +28,7 @@ Follow us on Twitter [@rustconf](https://twitter.com/rustconf).
 
  [rc-talks]: http://rustconf.com/program.html
  [rc-ticks]: http://rustconf.com/register.html
- [rc-schol]: (https://tilde.wufoo.com/forms/rustconf-scholarships/)
+ [rc-schol]: https://tilde.wufoo.com/forms/rustconf-scholarships/
 
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