Removed s.el as a dependency

As per the issue
#293 removed s.el
so that there is one less dependency for this mode that isn't part of
the standard Emacs release.

Author: dotemacs

clj-refactor.el

@@ -31,7 +31,6 @@
 
 (require 'seq)
 (require 'clj-refactor-compat)
-(require 's)
 (require 'yasnippet)
 (require 'paredit)
 (require 'multiple-cursors-core)