Release v8.1.5

• Add script to automatically generate and upload the sourcemap files to the dashboard on generating a release build. To activate this script, unlink using the older version, update and then link again.
• Improve Replies.hasChats(callback) API implementation, now the callback is always invoked with a boolean value indicating if the user has chats.
• Fix mixed import with module.exports
• Fix linking Instabug fails on windows.