Upgrade devDependencies

Author: pascalduez

package.json

@@ -117,16 +117,16 @@
     "babel-cli": "^6.26.0",
     "babel-plugin-transform-builtin-extend": "^1.1.2",
     "babel-plugin-transform-runtime": "^6.22.0",
-    "babel-preset-env": "^1.6.0",
-    "coveralls": "^3.0.0",
-    "dateformat": "^3.0.2",
+    "babel-preset-env": "^1.7.0",
+    "coveralls": "^3.0.2",
+    "dateformat": "^3.0.3",
     "jsesc": "^2.5.1",
     "mocha": "^3.4.2",
     "nyc": "^11.2.1",
     "opn-cli": "^3.1.0",
-    "safe-buffer": "^5.1.1",
+    "safe-buffer": "^5.1.2",
     "sinon": "^2.3.4",
     "standard": "^10.0.3",
-    "vinyl": "^2.1.0"
+    "vinyl": "^2.2.0"
   }
 }