Update *send* dependency

[pdehaan]

See https://nodesecurity.io/advisories/send-directory-traversal

For a full list of outdated modules, see:

$ git clone https://github.com/wearefractal/lute.git .

$ npm install

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

$ # sudo npm i nsp -g
$ nsp audit-shrinkwrap
Name  Installed   Patched  Vulnerable Dependency
send    0.6.0    >= 0.8.4  lute
qs      0.6.6     >= 1.x   lute > tiny-lr

$ npm outdated --depth 0
Package        Current  Wanted  Latest  Location
gulp-util       2.2.20  2.2.20   3.0.1  gulp-util
minimist         0.2.0   0.2.0   1.1.0  minimist
replacestream    0.1.4   0.1.4   0.2.0  replacestream
send             0.6.0   0.6.0   0.9.2  send
tiny-lr          0.0.9   0.0.9   0.1.4  tiny-lr

$ travis-lint # http:https://lint.travis-ci.org/wearefractal/lute

$ # sudo npm i pjv -g
$ pjv -wr
package.json is NOT valid
{ valid: false,
  errors: [ 'Type for field repository, was expected to be object, not string' ],
  warnings:
   [ 'Missing recommended field: keywords',
     'Missing recommended field: bugs',
     'Missing recommended field: contributors' ] }