Update to ethereumjs-vm 2.0.1

package.json

@@ -31,7 +31,7 @@
     "ethereumjs-block": "^1.2.2",
     "ethereumjs-tx": "^1.1.1",
     "ethereumjs-util": "^4.4.0",
-    "ethereumjs-vm": "^1.4.0",
+    "ethereumjs-vm": "^2.0.1",
     "http-server": "0.9.0",
     "jquery": "^2.2.0",
     "js-base64": "^2.1.9",

src/app/execution-context.js

@@ -16,7 +16,10 @@ if (typeof window.web3 !== 'undefined') {
   web3 = new Web3(new Web3.providers.HttpProvider('http://localhost:8545'))
 }
 
-var vm = new EthJSVM(null, null, { activatePrecompiles: true, enableHomestead: true })
+var vm = new EthJSVM({
+  enableHomestead: true,
+  activatePrecompiles: true
+})
 vm.stateManager.checkpoint()
 
 /*