Update README with info about downloads

README

@@ -1,6 +1,7 @@
 CATCH is an automated test framework for C, C++ and Objective-C.
 
 The latest stable version can be found as a single header in the Downloads section.
+(The Downloads section is now deprecated on GitHub. Until I move this somewhere else for CATCH it can still be reached here: https://github.com/philsquared/Catch/downloads)
 
 For documentation see the wiki at: https://github.com/philsquared/Catch/wiki