chore(docs): documenting test

Author: codebender828

src/test/extending-components.test.js

@@ -78,6 +78,7 @@ describe('extending components', () => {
     expectCSSMatches('.a {color: blue;}.a > h1 {font-size: 4rem;} .b {color: red;}')
   })
 
+  // Skipped because test fails
   xit('should keep default props from parent', () => {
     const parentProps = {
       color: {