Updated CHANGES.txt for fixes in r189
Updated CHANGES.txt for fixes in r189

dkomanov/JavaHamcrest,dkomanov/JavaHamcrest,wgpshashank/JavaHamcrest,wgpshashank/JavaHamcrest,mnk/hamcrest,mmichaelis/JavaHamcrest,alb-i986/JavaHamcrest,akruijff/JavaHamcrest,jforge/JavaHamcrest,plow/JavaHamcrest,josephw/JavaHamcrest,alb-i986/JavaHamcrest,josephw/JavaHamcrest,plow/JavaHamcrest,tomwhoiscontrary/JavaHamcrest,rysh/JavaHamcrest,rysh/JavaHamcrest,mnk/hamcrest,akruijff/JavaHamcrest,jforge/JavaHamcrest,mmichaelis/JavaHamcrest,vizewang/JavaHamcrest,tomwhoiscontrary/JavaHamcrest,vizewang/JavaHamcrest