Combination on --available and --changed-log fails

I would have expected
`next-update --available --changed-log`
to work, but it fails with the message
```
_.pluck(toCheck, 'name'),
^
TypeError: _.pluck is not a function
at Object.available (/home/dev/.../node_modules/next-update/src/next-update.js:29:11)
at Object. (/home//dev/.../node_modules/next-update/bin/next-update.js:29:6)
at Module._compile (module.js:624:30)
at Object.Module._extensions..js (module.js:635:10)
at Module.load (module.js:545:32)
at tryModuleLoad (module.js:508:12)
at Function.Module._load (module.js:500:3)
at Function.Module.runMain (module.js:665:10)
at startup (bootstrap_node.js:187:16)
at bootstrap_node.js:608:3
```

Any chance to make this available?

Reproduce `next-update --available --changed-log`, then inspect `src/next-update.js` around the `available` entry point and `bin/next-update.js` around command dispatch, as named in the stack trace. Confirm the combined command no longer throws and produces the expected availability and changed-log output.

Written by the indexing model from the issue text.