update readme headings

2 jobs for master in 51 seconds
Status Job ID Name Coverage
  Test
failed #227871272
pages

00:00:51

failed #227870886
pages

00:00:55

 
Name Stage Failure
failed
pages Test
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the svg-charts@0.0.1 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?

npm ERR! A complete log of this run can be found in:
npm ERR! /root/.npm/_logs/2019-06-09T11_14_42_499Z-debug.log
ERROR: Job failed: exit code 1