Lint the ruby plugin code

[palash25]

What is linting? https://www.wikiwand.com/en/Lint_(software) Tools helpful in linting:

• https://docs.coala.io/en/latest/Users/Tutorial.html
• https://github.com/rubocop-hq/rubocop

[palash25]

If someone wants to try a hand at linting I am fine with giving up this issue. Ping me if you want this and I will remove my assignment.

[debck]

@palash25 I would like to work on this issue

[palash25]

assigned