initial value of sum should be the first value instead of 0

[meiyou9]

echarts-simple-transform/src/aggregate.ts

Line 509 in 73c7cfc

return 0;

[nico-hernandez]

Is sum working for you? Look at this:

I only got zeros, if i change the aggregation to max for instance, it works ok.

[vFrancois29]

Hi !Can you release this fix on npm?

[helgasoft]

+1
It has been 3(three) years and this fix still has not made it from aggregate.ts to ecSimpleTransform.js ?!
Finally someone will fork it and become the "official" echarts-simple-transform...