Update db.php
Update db.php

Output feedback message and add example for `wp db drop --yes`
rodrigoprimo/wp-cli,nyordanov/wp-cli,gitlost/wp-cli,gitlost/wp-cli,aaemnnosttv/wp-cli,nyordanov/wp-cli,aaemnnosttv/wp-cli,gitlost/wp-cli,GaryJones/wp-cli,aaemnnosttv/wp-cli,trepmal/wp-cli,GaryJones/wp-cli,miya0001/wp-cli,2ndkauboy/wp-cli,trepmal/wp-cli,2ndkauboy/wp-cli,nyordanov/wp-cli,rodrigoprimo/wp-cli,miya0001/wp-cli,GaryJones/wp-cli,2ndkauboy/wp-cli,trepmal/wp-cli,miya0001/wp-cli,rodrigoprimo/wp-cli