Feature/scatter chart

[apertureless]

Add Scatter Chart

Implement #129

New Chart type added (Scatter), which is actually only syntactic sugar for the line chart with x/y data points.

You can now easy create a scatter chart with:

import {Scatter} from 'vue-chartjs'

export default Scatter.extend({})

⚠ Important note

As the structure of the passed data is quite different from the other charts, neither the reactiveProp nor reactiveData mixins will work with it.

It will require some refactoring and additions to the mixins to work with it.

[codecov]

Codecov Report

Merging #136 into develop will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           develop   #136   +/-   ##
======================================
  Coverage      100%   100%           
======================================
  Files           10     11    +1     
  Lines           86     95    +9     
======================================
+ Hits            86     95    +9

Impacted Files	Coverage Δ
src/BaseCharts/Scatter.js	100% <100%> (ø)

[nstCactus]

I think you may be missing an export in the index.js file. Using version 2.7.0, it seems to be still missing and so:

import { Scatter } from "vue-chartjs";
console.log(Scatter); // Logs undefined

If you wish I can prepare a PR to fix it.

[apertureless]

Ups! Thanks for that one.
Fixed in 2.7.1 🙈

[nstCactus]

That was quick, thanks a lot!