chore(package): update dependencies

Author: greenkeeper[bot]

package.json

@@ -5,12 +5,12 @@
   "main": "gulpfile.js",
   "dependencies": {
     "code-prettify": "^0.1.0",
-    "fs-extra": "^7.0.1",
+    "fs-extra": "^8.1.0",
     "gulp": "^4.0.1",
     "gulp-connect": "^5.7.0",
     "harmonize": "^2.0.0",
     "lodash": "^4.17.11",
-    "marked": "^0.6.2",
+    "marked": "^0.7.0",
     "metalsmith": "^2.3.0",
     "metalsmith-beautify": "^0.2.0",
     "metalsmith-headings": "^0.2.0",