chore(package): update style-loader to version 0.15.0
chore(package): update style-loader to version 0.15.0

Closes #20

https://greenkeeper.io/

nhsuk/register-with-a-gp-beta-web,nhsuk/register-with-a-gp-beta-web,nhsuk/register-with-a-gp-beta-web