Migrate package-lock.json file to version 2

[smoya]

Reason/Context

Parser-JS requires now Node.js 14 and npm7 or higher. This means package-lock.json version should be always set to 2.

Description

In order to unify development requirements, I suggest all repositories to stick with that requirements. In order to do that, the following is needed:

• Clarify this requirement under Development section on this repository README file.
• To update package-lock.json to version 2. This is automatically done when running npm install if the npm version used is 7 or higher.

Related:

• https://github.com/asyncapi/.github/issues/177

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