Get the real path of the files and ensure uniqueness

rubberin

@@ -188,7 +188,7 @@ end
 
 # Add input file with dependancies to the watch list and start event loop.
 notifier = INotify::Notifier.new
-dirs = files.map { |file| File.dirname(file) }
+dirs = files.map { |file| Pathname.new(file).dirname.realpath }.uniq
 dirs.each do |dir|
   # Set up a watch per directory
   notifier.watch(dir, :close_write) do |ev|