Fix link in README.md

Author: sambokai

README.md

@@ -5,7 +5,7 @@ A curated list of 600+ Short-URL services (i.e goo.gl, bit.ly)
 A lot of the entries are deprecated. They are left in the list due to legacy-usage and completeness. You should filter them out programatically in your project.
 
 ### Contributions
-Please keep the main list sorted alphabetically AND remove duplicates. [Sort & duplicate-removal tool](alphabetizer.flap.tv/)
+Please keep the main list sorted alphabetically AND remove duplicates. [Sort & duplicate-removal tool](http://alphabetizer.flap.tv/)
 
 ##### Suggestions:
 * Sort by popularity - A separate list, sorted by popularity. (i.e. goo.gl, bit.ly, ow.ly)