Fixed breaking change in minor bump of 'mime' package.

[tonyanziano]

Changelog Entry

Description

While running npm audit on the Emulator for compliance, the installed version of mime was bumped to 2.4.3 which contains a breaking change for mime-wrapper.js in Web Chat.

The old code used to require type definitions from .json files:

  require('mime/types/standard.json'),
  require('mime/types/other.json')

but these files were changed to .js files in a recent update.

This was breaking the Emulator as well when trying to build and webpack Web Chat.

Specific Changes

• bumped mime to 2.4.3
• changed require() statements to pull from .js files instead of .json