Add Snyk as a devDependency in the project

[elrrrrrrr]

Expected behavior

should not do postinstall script of snyk

Actual behavior

it will install a external module of snyk

Steps to reproduce the behavior

npm i alertify.js

Version of Alertify in use

latest: 1.0.2

I suggest adding Snyk as a devDependency in the project. Snyk is a security and dependency management tool that helps identify and fix vulnerabilities in our dependencies. By including it as a devDependency, we can better maintain the security and stability of the project during development.