Spell checker for vscode

As Oriol recommended, I've installed a spell checker for VSCode.

I've tried a couple of them, and I've finally choosed this one: https://marketplace.visualstudio.com/items?itemName=streetsidesoftware.code-spell-checker

English dictionary it's included. Add-on dictionaries available.

One thing: I had to enable spell checking for ruby explicitly:

• Open command list (Cmd+Shift+P on Mac)
• Write "Show Spell Checker Configuration Info"
• Enable ruby (languages are sorted alphabetically)

Let's get spelling errors PRs free 🖖