fix(package): update sha3 to version 2.0.4

Closes #88

Author: greenkeeper[bot]

package.json

@@ -92,7 +92,7 @@
     "lodash": "^4.17.11",
     "nanoid": "^2.0.1",
     "openzeppelin-solidity": "2.0.0",
-    "sha3": "^1.2.2",
+    "sha3": "^2.0.4",
     "solidity-bytes-utils": "0.0.5",
     "truffle-flattener": "^1.2.8"
   }