Fixing Security Issues

[mihok]

Description

Fixing security issues with outdated packages

Motivation

Security

Changes

• Upgrading electron to 4.0.0
• Removing coveralls and using jest --coverage for now..
• Removing plugin related to coveralls that jest --coverage already uses
• Upgrading optionalDependencies so npm doesnt complain
• Fixed small eslint issue with imports using .js file extension