Update devDependencies

package.json

@@ -19,21 +19,21 @@
     "babel-preset-es2015": "^6.18.0",
     "browser-sync": "^2.10.0",
     "cross-spawn": "^5.0.0",
-    "del": "^2.2.0",
-    "gulp": "^3.9.0",
-    "gulp-autoprefixer": "^3.1.0",
+    "del": "^2.2.2",
+    "gulp": "^3.9.1",
+    "gulp-autoprefixer": "^3.1.1",
     "gulp-babel": "^6.1.2",
-    "gulp-concat": "^2.6.0",
-    "gulp-cssnano": "^2.1.1",
+    "gulp-concat": "^2.6.1",
+    "gulp-cssnano": "^2.1.2",
     "gulp-if": "^2.0.0",
-    "gulp-load-plugins": "^1.4.0",
+    "gulp-load-plugins": "^1.5.0",
     "gulp-notify": "^2.2.0",
-    "gulp-sass": "^2.2.0",
+    "gulp-sass": "^3.1.0",
     "gulp-sourcemaps": "^2.2.0",
     "gulp-uglify": "^2.0.0",
     "js-yaml": "^3.5.4",
-    "require-dir": "^0.3.0",
-    "run-sequence": "^1.1.5",
+    "require-dir": "^0.3.1",
+    "run-sequence": "^1.2.2",
     "yargs": "^6.4.0"
   },
   "scripts": {