Merge pull request #205 from haskellfoundation/freckle-hiring

Add hiring link for Freckle

Author: goldfirere

donations/sponsors/freckle.markdown

@@ -4,4 +4,5 @@ logo: /assets/images/sponsors/freckle/freckle-logo-683.png
 srcset: /assets/images/sponsors/freckle/freckle-logo-200.png 200w, /assets/images/sponsors/freckle/freckle-logo-400.png 400w, /assets/images/sponsors/freckle/freckle-logo-683.png 683w
 externalUrl: https://freckle.com/
 level: Functor
+careersUrl: https://jobs.smartrecruiters.com/Renaissance/743999815260637-staff-software-engineer-full-stack-
 ---