Added rescue to prevent crashing on Windows

'unsupported signal SIGUSR1' occurs when running on Windows. SIGINT is supported in Windows and the rest would be ignored.

lib/sidekiq/cli.rb

@@ -46,8 +46,12 @@ module Sidekiq
       self_read, self_write = IO.pipe
 
       %w(INT TERM USR1 USR2 TTIN).each do |sig|
-        trap sig do
+        begin
-          self_write.puts(sig)
+          trap sig do
+            self_write.puts(sig)
+          end
+        rescue ArgumentError
+          puts "Signal #{sig} not supported"
         end
       end