removed unused dependency.

Author: mckn

npm-shrinkwrap.json

@@ -22,7 +22,6 @@
   "homepage": "https://github.com/mckn/gulp-nuget",
   "dependencies": {
     "fs-extra": "^0.26.7",
-    "fs-extra-promise": "^0.4.1",
     "gulp-util": "^3.0.7",
     "stream-browserify": "^2.0.1",
     "through2": "^2.0.1",