remove old broken example, fixes #4016

examples/leak.rb

@@ -1,27 +0,0 @@
-# Making sure we do not leak memory
-
-require 'sidekiq'
-
-$c = 0
-$max = 10_000
-
-# Start up sidekiq via
-# ./bin/sidekiq -r ./examples/leak.rb > /dev/null
-class MyWorker
-  include Sidekiq::Worker
-
-  def perform
-    $c += 1
-    if $c % 100 == 0
-      GC.start
-      memory = `ps -o rss -p #{Process.pid}`.chomp.split("\n").last.to_i
-      $stderr.puts "Using memory #{memory}"
-    end
-    if $c >= $max
-      exit
-    end
-  end
-end
-
-# schedule some jobs to work on
-$max.times { MyWorker.perform_async }