Feature: height and fullscreen option

[Caesarovich]

In answer to #29 , here I have added an height constraint option and a fullscreen option.

Example with height option:

import boxen from 'boxen';

console.log(boxen('foo bar', {height: 5}));
// ┌───────┐
// │foo bar│
// │       │
// │       │
// └───────┘

Sorry for the wait, I have found a job and couldn't find many time to focus on this issue.

---

Fixes #29

[sindresorhus]

// @LitoMore

[Caesarovich]

@sindresorhus Should we really wait for @LitoMore ? The features are there and working as expected ;)

[LitoMore]

@sindresorhus Should we really wait for @LitoMore ? The features are there and working as expected ;)

I will take a look.

[LitoMore]

Please add some tests for the fullscreen option.

BTW, as we discussed before at #29 (comment), the fullscreen option should be able to accept a function for modifications.

[LitoMore]

Readme needs to be updated.

[Caesarovich]

@LitoMore I'm wondering if having the possibility to use a function as argument isn't too much complexity for little benefits

[LitoMore]

I'm wondering if having the possibility to use a function as argument isn't too much complexity for little benefits

See #29 (comment).

[Caesarovich]

// @LitoMore

[Caesarovich]

Should this be considered done ? :) @sindresorhus

[sindresorhus]

Looks good :)