Cannot set rgba color nor opacity for particular data in line chart

[steven-pribilinskiy]

https://codepen.io/anon/pen/BqPbMP

In order to dim/highlight particular data in a chart we need to increase transparency of such lines.

When applying a color in rgba format the lines appear gray on the chart, although such colors appear correctly in legend and tooltip.

  colors: [
    'rgba(42, 158, 251, .3)'
  ],

[junedchhipa]

If it works in legend, then I need to take a look why it doesn't work for paths.

[junedchhipa]

This commit fixes it.
From 2.1.6 onwards, colors will accept rgba

[steven-pribilinskiy]

@junedchhipa Great! Waiting for release