chore(package): update prismjs-package to version 0.7.18

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -29,7 +29,7 @@
     "lang-map": "^0.4.0",
     "lodash": "^4.16.2",
     "parse-diff": "^0.3.2",
-    "prismjs-package": "^0.7.17",
+    "prismjs-package": "^0.7.18",
     "react": "^15.3.2",
     "react-dom": "^15.3.1"
   },