alpha value upgradation

[RishikeshB]

Hi,
Thank you @kurkle for this great library! As in issue #93 I'd like to increase chart color intensity for better visualization. For this added 'alpha' value where set alpha value to 1 (alpha:1) the intensity of the chart flow color increases or else by default the color value will be 0.5. This will be helpful when given only two color for large dataset.

Eg: I'm not given alpha value and not given any color for flow, chart takes its default color values has red and green :
code:

data: {
datasets: [{
label: 'My sankey',
data,
}]
},

chart looks like:

Eg: I'm given alpha value as 1 and not given any color for flow, chart takes its default color values has red and green:
code:

data: {
datasets: [{
label: 'My sankey',
data,
alpha:1
}]
},

chart looks like

I'm submitting a PR that proposes a new option.

[stockiNail]

@RishikeshB @kurkle if I may jump in the thread, maybe the best thing is to remove any default alpha color value and delegate the user to decide the colors to apply. Just thinking loud.

[kurkle]

I agree with @stockiNail, it would be best to remove the .alpha call and use whatever already is in the color provided.

[RishikeshB]

but when we remove .alpha call, any of us may required a lite colors to view flow. alpha value will serve better usage switching from dark and light.

[kurkle]

please remove the added files in dist too

[kurkle]

Also this should be documented, can you do that too?

[sonarcloud]

Quality Gate passed

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