Update validator dependency

[pdehaan]

See https://nodesecurity.io/advisories/validator_XSS_Filter_Bypass_via_Encoded_URL (you also may want to bump connect to fix some earlier issues w/ qs and send, see comment below).

[pdehaan]

Here was my full install log:

$ git clone https://github.com/txtszas/webtail.git .

$ npm install

$ npm shrinkwrap --dev
wrote npm-shrinkwrap.json

$ # sudo npm i nsp -g
$ nsp audit-shrinkwrap
Name       Installed   Patched  Vulnerable Dependency
qs           0.6.5     >= 1.x   esaytail > connect
send         0.1.4    >= 0.8.4  esaytail > connect
validator    1.5.0     >=2.0.0  esaytail

$ npm outdated --depth 0
Package    Current  Wanted  Latest  Location
commander    1.3.2   1.3.2   2.5.0  commander
connect     2.11.0  2.11.0   3.3.1  connect
cookie       0.1.0   0.1.0   0.1.2  cookie
socket.io   0.9.16  0.9.16   1.2.0  socket.io
validator    1.5.0   1.5.0  3.22.0  validator

# .travis.yml not found

$ # sudo npm i package-json-validator -g
$ pjv -wr
{ valid: true,
  warnings:
   [ 'Missing recommended field: bugs',
     'Missing recommended field: contributors' ],
  recommendations:
   [ 'Missing optional field: homepage',
     'Missing optional field: engines' ] }