move zos (cli) to devDependency

package.json

@@ -59,11 +59,11 @@
     "solidity-coverage": "^0.4.15",
     "solium": "^1.1.6",
     "truffle": "^4.1.5",
-    "truffle-hdwallet-provider": "0.0.3"
+    "truffle-hdwallet-provider": "0.0.3",
+    "zos": "^0.3.7"
   },
   "dependencies": {
     "dotenv": "^4.0.0",
-    "zos": "^0.3.7",
     "zos-lib": "0.0.5"
   }
 }