Fixes for child compiler instances

Child compiler error fix (#54)

* Upgraded all depepndencies to latest

* Updated CI script.

* Configured travis for node@10.

* Added warning/error handling for child compiler instances (#53).

* Updated version

Converted to TypeScript; Increased test coverage.

Release/2.0.0 (#50)

Refactored project to use TypeScript; increased unit test coverage.

Updated node-notifier dependency to latest version to fix #43.

1.2.2

Updated node-notifier to fix #43; added test coverage.

Added showDuration Option

1.2.1

Updated changelog and package version

Updated node-notifier dependency to latest version to fix #45.

1.1.1

Updated node-notifier dependency to latest version to fix #45.

Added onCompileStart and onComplete Callback Options

Merge pull request #44 from RoccoC/feature/callbacks

Feature/callbacks

Converted to TypeScript; Increased test coverage.

Converted project to TypeScript. Increased test coverage as well as identified and fixed an issue in handling warning messages from webpack.

Technically this release should be backward compatible with version 1.x.x, but bumping a major version since this was a large refactor (relatively speaking). :)

1.0.3

Updated dependencies to fix js-yaml vuln.

0.1.28

Fix for #28; updated to node-notifier@5.2.1.

0.1.23

Updated terminal activation logic to handle VS Code.