Update Pramp to exponent

Pramp is outdate

getting_hired/applying_and_interviewing/preparing_to_interview_and_interviewing.md

@@ -46,7 +46,7 @@ You'll need to read up on a variety of things that weren't focused on in the pre
 
 ### Links
 
-* [Pramp.com](https://www.pramp.com/ref/odin1) allows you to prepare for coding interviews and practice your coding skills with peers.
+* [Exponent.com](https://www.tryexponent.com/practice?ref=pramp&utm_source=pramp&utm_campaign=pramp_banner) allows you to prepare for coding interviews and practice your coding skills with peers.
 * [Interviewing.io](http://interviewing.io/) gives you a chance to practice tech screens anonymously online.
 * [Interview Tips](http://www.interviewcake.com/tips-and-tricks)
 * [How to Ace Your Technical Interview](http://insights.dice.com/2014/10/12/ace-technical-interview/)