Remove fs from deps, fixes #312

gulpfile.js

 const del = require('del');
-const fs = require('fs');
 const gulp = require('gulp');
 const merge = require('merge-stream');
 const rename = require('gulp-rename');

package.json

@@ -34,7 +34,6 @@
   "devDependencies": {
     "browser-sync": "^2.18.12",
     "del": "^3.0.0",
-    "fs": "0.0.2",
     "gulp": "^3.9.1",
     "gulp-gh-pages": "^0.5.4",
     "gulp-rename": "^1.2.2",