Do not include .map files in npm publish output

[wictorwilen]

Currently when bundling adaptive cards through the botframework-webchat npm package you get a set of webpack warnings. Referenced here microsoft/BotFramework-WebChat#974

The way to work around this warning is to delete the .map files in the build output or better remove them when publishing to the npm repository (through the .npmignore file)

[pschaeflein]

Problem also exists when bundling adaptive cards in a SharePoint Framework web part. The fix submitted by Wictor resolves the issue.

[ghost]

Hi @wictorwilen. We have acknowledged this issue report. Please continue to follow this issue for updates/progress/questions.

[jonmill]

This issue should be fixed in the recent versions of the package; if that is not the case, please re-open the issue and we'll engage. Thanks!