npm install fails on node v16

[gitcommitshow]

npm install fails on node v16 because of the dependency node-sass which is set to v4. And node v16 supports only node-sass v6+ as mentioned in node-sass repo. So this leads to the failure.

Fix: Until we resolve #35, we can put a strict check for node version which will show error for node version if it is node v16 or above. This way, user will have better experience than the current on(using v16 and then figuring out the issues which could be solved only by updating this project's dependency).