Update stylelint peer dependency to include stylelint 15 (#35)

Author: alex-e-leon

package.json

@@ -50,7 +50,7 @@
     "stylelint": "^14.6.0"
   },
   "peerDependencies": {
-    "stylelint": "10 - 14"
+    "stylelint": "10 - 15"
   },
   "eslintConfig": {
     "env": {