Update dependencies

Author: joaosimbiose

package.json

@@ -26,10 +26,10 @@
   },
   "homepage": "https://github.com/SlicingDice/slicingdice-javascript",
   "devDependencies": {
-    "babel-cli": "^6.11.4",
-    "babel-preset-es2015": "^6.13.2",
-    "async": "^2.0.1",
-    "sleep": "^4.0.0"
+    "babel-cli": "^6.26.0",
+    "babel-preset-es2015": "^6.24.0",
+    "async": "^2.6.0",
+    "sleep": "^5.1.1"
   },
   "dependencies": {}
 }