Small style fix.

Author: aardvark179

spec/ruby/library/monitor/synchronize_spec.rb

@@ -29,7 +29,7 @@
   end
 
   it "raises a LocalJumpError if not passed a block" do
-    -> {Monitor.new.synchronize }.should raise_error(LocalJumpError)
+    -> { Monitor.new.synchronize }.should raise_error(LocalJumpError)
   end
 
   it "raises a thread error if the monitor is not owned on exiting the block" do