Update from internal Meeting 2018-09-11

Merge pull request #10 from ChromatixAU/change/2018-09-11

rule changes from dev meeting

v0.1.10

• Add additional at-rules error, warn and while

v0.1.9

• Prevent .css for @import's, as it's bad for performance

v0.1.8

• Updates to documentation and linting/CI configuration
• Made tests a little more granular

v0.0.2

• Added linting & CI.
• Updated README documentation.
• Removed stylelint rules that have been removed since our original config was written.
• Fixed linting issues and tests.

v0.0.1

Initial release.