Sync CODEOWNERS (#352)

Author: ybiquitous

.github/CODEOWNERS

@@ -0,0 +1,7 @@
+# https://help.github.com/articles/about-codeowners/
+
+# All proposed file changes under the `.github/` folder must be approved by the owners team prior to merging.
+.github/ @stylelint/owners
+
+# Require approvals by the owners team when updating dependencies or package metadata.
+package.json @stylelint/owners