Try to get data to the parent container more quickly.

I was running some code that does `yield n` every 2 seconds. If the
inmate gets `kill -9`ed, the yielded data never gets to the parent. If
the inmate gets `kill -INT`ed, the yielded data all shows up in a batch
as the inmate exits.

This is an attempt to make the data show up in the parent more quickly.

bin/hoosegow

@@ -4,6 +4,7 @@
 require_relative '../lib/hoosegow'
 
 real_stdout = $stdout.dup
+real_stdout.sync = true
 intercepted_stdout, intercepting_stdout = IO.pipe # returns reader,writer
 $stdout.reopen(intercepting_stdout)