Fix timeout specs

* The timeout might not happen immediately due to GC, context switches,
  other processes, load, etc.

Author: eregon

spec/ruby/library/timeout/timeout_spec.rb

@@ -5,15 +5,15 @@
   it "raises Timeout::Error when it times out with no specified error type" do
     lambda {
       Timeout.timeout(1) do
-        sleep 3
+        sleep
       end
     }.should raise_error(Timeout::Error)
   end
 
   it "raises specified error type when it times out" do
     lambda do
       Timeout.timeout(1, StandardError) do
-        sleep 3
+        sleep
       end
     end.should raise_error(StandardError)
   end