chore(release): 2.0.0

This has no config changes, but it's a major version bump because if
somebody upgrades, their linting will fail until they add styelint to
their project as a peer dependency. This should be a straightforward
change (and it won't affect production code). The major version bump
will help manage expectations.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@sparkbox/stylelint-config-sparkbox",
-  "version": "1.0.3",
+  "version": "2.0.0",
   "description": "A set of stylelint customizations that we use at Sparkbox.",
   "main": "index.js",
   "keywords": [