update sleep lib to 3.0.0

Author: iurimatias

package.json

@@ -23,7 +23,7 @@
     "python": "^0.0.4",
     "read-yaml": "^1.0.0",
     "shelljs": "^0.5.0",
-    "sleep": "^2.0.0",
+    "sleep": "^3.0.0",
     "sync-me": "^0.1.1",
     "toposort": "^0.2.10",
     "web3": "^0.8.1",