[Feature] add additional text for suggest.

[niazlake]

I'm submitting a ...

• [ ] bug report
• [x] feature request
• [ ] support request

What is the current behavior?

In current behaviors, there is no additional field below the main text.

What is the expected behavior?

I would like to additionally add a field for it. Something like a

How are you importing Vue-simple-suggest?

• [ ] ESNext (original code, single-file .vue component, css included) (import VueSimpleSuggest from 'vue-simple-suggest/lib')
• [x] ES6 (import VueSimpleSuggest from 'vue-simple-suggest')
• [ ] ES7 and above (import VueSimpleSuggest from 'vue-simple-suggest/dist/es7')
• [ ] Bundled version (import VueSimpleSuggest from 'vue-simple-suggest')
• [ ] CommonJS (const VueSimpleSuggest = require('vue-simple-suggest'))
• [ ] UMD Component (<script type="text/javascript" src="https://unpkg.com/vue-simple-suggest"></script>)

What is the motivation / use case for changing the behavior?

For creating better exp. for users.

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, gitter, etc)

[niazlake]

Is already ready to use https://github.com/KazanExpress/vue-simple-suggest#custom-input.