Fix project vulnerabilities

[fosco]

The following packages need to be updated for security reasons:

• eslint
• js-yaml
• webpack-dev-server
• merge
• handlebars
• lodash
• lodash.template
• mem

[oznakn]

Hi, I can take this if it is okey for you. Btw, some libraries are deprecated and old, I can migrate them to the new versions If you want (ex: webpack).

[fosco]

Thank you @oznakn, it's all yours! I opened this issue just to fix vulnerabilities, so update webpack only if necessary; we can open a new issue for that later. :)

[oznakn]

I created #7, could you check? 😊