mention upr and tap simulators in README
mention upr and tap simulators in README

Change-Id: I5dd0b3e868942edfeacfd8d1abc57db3d4d4377e
Reviewed-on: http://review.couchbase.org/40578
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>
Tested-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>

pavel-paulau/perfrunner,PaintScratcher/perfrunner,hsharsha/perfrunner,EricACooper/perfrunner,pavel-paulau/perfrunner,EricACooper/perfrunner,couchbase/perfrunner,couchbase/perfrunner,mikewied/perfrunner,pavel-paulau/perfrunner,EricACooper/perfrunner,pavel-paulau/perfrunner,EricACooper/perfrunner,vmx/perfrunner,thomas-couchbase/perfrunner,vmx/perfrunner,PaintScratcher/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,dkao-cb/perfrunner,mikewied/perfrunner,dkao-cb/perfrunner,thomas-couchbase/perfrunner,pavel-paulau/perfrunner,couchbase/perfrunner,hsharsha/perfrunner