Added danger and question symbols

[Berkmann18]

I felt it that this package was missing some other log symbols such as the question mark one and the danger skull one (although that one isn't on code page 437 and don't have any "danger"/"death" related icons) so I opened this PR.

[Berkmann18]

It seems that there's something wrong on v4 since both commits succeeded on both v6 and v8 but I notice this error on the v4 build:

> xo && ava
/home/travis/build/sindresorhus/log-symbols/node_modules/xo/cli-main.js:115
const {input, flags: opts} = cli;
      ^
SyntaxError: Unexpected token {
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:373:25)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (/home/travis/build/sindresorhus/log-symbols/node_modules/xo/cli.js:15:2)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)

It seems that this error is relevant to xo and not this package.

[sindresorhus]

What's the use-cases for these new icons?

[sindresorhus]

(although that one isn't on code page 437 and don't have any "danger"/"death" related icons)

The whole point of this package is to have good fallbacks for all the icons.

[Berkmann18]

The use case is that it will enable users to use more log symbols with other types of logs namely questions (e.g: for prompts or any thing labelled as a question).

The whole point of this package is to have good fallbacks for all the icons.

Makes sense, in this case the only addition would be the question one.

[sindresorhus]

But this package is meant for actual logging, not for arbitrary printing to the console, like a question prompt. I already have a package that includes symbols for any kind of use: https://github.com/sindresorhus/figures/blob/9d0895812c447617e35a47ac6200ad0ee1e9f2a0/index.js#L103

[Berkmann18]

Fair enough.