Update ROADMAP.md

Author: yocontra

ROADMAP.md

@@ -3,4 +3,5 @@
  - Site should have plugin search
  - Site plugin search should utilize github stars for sorting
  - Site plugin search should have a blacklist for bad plugins that don't pass acceptance tests
-- gulp plugin acceptance tests that tell you if plugins work correctly
+- gulp plugin acceptance tests that tell you if plugins work correctly
+- Split gulp-util.File object out into a well tested individual repo (spec?)