Add missing ChangeLog item re: fs.stat improvement
Add missing ChangeLog item re: fs.stat improvement

This was a very significant improvement that should have been called out
explicitly.

I added 'review all libuv changes' to my build checklist.  It won't
happen again.  Sorry, @igorzi.

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node