chore(package): update express-validator to version 2.21.0 (#1460)
chore(package): update express-validator to version 2.21.0 (#1460)

https://greenkeeper.io/
mozilla/tofino,victorporof/tofino,jsantell/tofino,bgrins/tofino,mozilla/tofino,jsantell/tofino,victorporof/tofino,jsantell/tofino,bgrins/tofino,bgrins/tofino,bgrins/tofino,jsantell/tofino,mozilla/tofino,mozilla/tofino