Reports Data API not working properly

Hello guys,

I'm facing two issues when trying to get report data through the API :

1/ Authentication issue :
When the request is being sent to the instance, authentication isn't done properly and the login page is sent back as response.
I traced it back to this PR : **https://github.com/adobe/acc-js-sdk/pull/57/files** which removed the Cookie from headers. Currently the auth is done through : **const headers = this._getAuthHeaders(false);** which is cleaner but disallows the cookies in the headers due to the "false" in the setCookie parameter of _getAuthHeaders method.

I hacked it by hardcoding the parameter to "true" adding back the cookies to the request headers and it solves the authentication issue but this brings me to the next issue.

2/ FEATURE_NOT_SUPPORTED : Reports Data

The query response return an html document which triggers the **CampaignException.FEATURE_NOT_SUPPORTED("Reports Data")** since the code in the report method expects an xml that begins with "

Start at Client.getReportData(), then trace _getAuthHeaders(false) and the report response handling that expects XML beginning with

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