Allow VictoryLabel to render multiple text inline

[matt-hernandez]

Checklist

• I've read through the Docs and Guides to make sure this functionality doesn't already exist

• I've searched open issues to make sure I'm not opening a duplicate issue

Description

I would like for there to be an option to have VictoryLabel render multiple </tspan> elements inline as opposed to on a new line.

I'm currently making a bar chart based off this design:

(screenshot from Sketch)

So I have two chunks of text: "% of Target", "44% for 2017". My first impulse was to use Victory Label. I wrote this jsx:

<VictoryLabel x={15} y={20}
  text={[ '% of target', '44% for 2017' ]}
  style={[{ fill: '#000' }, { fill: '#6128ff' }]}
/>

The rendered output looks like this:

(screenshot from Chrome)

Maybe there could be a inline attribute to tell VictoryLabel to render inline instead of multiline.

[parkerziegler]

FYI @matt-hernandez this PR took care of this issue. You should see the prop added in a future release of Victory.