I installed the eventdrops and when I run the demo example in the dist folder, the console gives error of d3.chart undefined and o.default undefined.

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**What you were expecting:**

**What happened instead:**

**Steps to reproduce:**

**Related code:**

```
insert short code snippets here
```

**Other information:**

**Environment**

* EventDrops version
* Browser:
* Stack trace (in case of a JS error):

Start by running the demo example in the dist folder and capture the full console output for the reported d3.chart and o.default errors. Compare the demo's environment and bundled files with the installed EventDrops package. Done means the demo runs without these undefined errors, but the issue provides no tests or concrete reproduction details.

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