Hide whitespace for easier github code reviews

TL:DR Hiding whitespace changes in github makes it much easier to see what’s been changed.

Sometimes people do very good work and fix indentation in the codebase. Having things indented correctly is great but when I’m doing a code review I want to focus on the code that has changed more then the whitespace that has changed.

Hide whitespace changes has made doing code reviews so much easier and I heartily endorse it to everyone I pair with.