README.md: switch to SVG badges.
Merge pull request #1617 from XhmikosR/readme-svg-badges

README.md: switch to SVG badges.
Make generate-identifier-data.js use 2 spaces like the rest of the files.
Merge pull request #1624 from XhmikosR/generate-identifier-data

Make generate-identifier-data.js use 2 spaces like the rest of the files.
Update dependencies.
Remove shelljs from devDependencies.

It's already in dependencies.