Update several gulp dependencies

Author: TimvdLippe

package-lock.json

@@ -16,15 +16,15 @@
     "del": "^3.0.0",
     "dom5": "^2.3.0",
     "eslint-plugin-html": "^4.0.1",
-    "fs-extra": "^4.0.3",
+    "fs-extra": "^5.0.0",
     "google-closure-compiler": "^20171112.0.0",
     "gulp": "^3.9.1",
     "gulp-babel": "^6.1.2",
     "gulp-eslint": "^4.0.0",
     "gulp-if": "^2.0.1",
     "gulp-replace": "^0.6.1",
-    "gulp-size": "^2.1.0",
-    "gulp-vulcanize": "^6.0.1",
+    "gulp-size": "^3.0.0",
+    "gulp-vulcanize": "^7.0.0",
     "lazypipe": "^1.0.1",
     "merge-stream": "^1.0.1",
     "parse5": "^3.0.3",