* Add SVGO as devDependencies and a NPM script to run it
* Update Contributing Guidelines
Change the instructions on how to use SVGO to optimize SVGs to use the
new dependency and NPM script.
* Add configuration for the NPM command to optimize SVGs
* Specify --precision in SVGO configuration file
* Update SVGO config ordering of attributes
To be in line with the fact that, as @davidklebanoff pointed out: "most
(all?) have the attributes in the order of role, viewbox, xmlns
(alphabetical)"
* Move SVGO --multipass argument to .svgo.yml
* Update SVGO dependency to 1.3.0
Now the force merge option works 🎉
See: https://github.com/svg/svgo/releases/tag/v1.3.0
* Update outdated "blocking" comment
