Set cover (unweighted) - adding link on under construction page

Author: Chris Pilcher

Under Construction.markdown

@@ -28,4 +28,4 @@ Special-purpose sorts:
 
 - [Minimum Edit Distance](Minimum Edit Distance/). Measure the similarity of two strings by counting the number of operations required to transform one string into the other.
 - [Treap](Treap/)
-- [Set Cover (Unweighted)][Set Cover (Unweighted)/]
+- [Set Cover (Unweighted)](Set Cover (Unweighted)/)