0.5.0 - Vue Test utils update + improvements

List of changes:

• Update vue-test-utils to latest major version - Closses #2
• Add jest-dom to follow best practices in the repository for tests. Vue-test-utils recommends this way for some deprecated methods
• Add data-testid attributes for elements in code as a good practice
• Update snapshot files with new attribute
• Add required node version in package.json
• Fix lint issues in the /done directory and improve checkbox component