ethereumjs dependency update in lib & simulator

remix-lib/package.json

@@ -15,13 +15,12 @@
   "main": "./index.js",
   "dependencies": {
     "async": "^2.1.2",
-    "ethereumjs-block": "^1.6.0",
-    "ethereumjs-tx": "^1.3.3",
-    "ethereumjs-util": "^6.1.0",
+    "ethereumjs-block": "^2.2.1",
+    "ethereumjs-tx": "^2.1.1",
+    "ethereumjs-util": "^6.2.0",
     "ethereumjs-vm": "4.1.1",
     "ethers": "^4.0.27",
     "events": "^3.0.0",
-    "fast-async": "^6.1.2",
     "solc": "^0.5.0",
     "web3": "0.20.6"
   },

remix-lib/src/execution/txRunner.js

 'use strict'
-var EthJSTX = require('ethereumjs-tx')
+var EthJSTX = require('ethereumjs-tx').Transaction
 var EthJSBlock = require('ethereumjs-block')
 var ethJSUtil = require('ethereumjs-util')
 var BN = ethJSUtil.BN

remix-simulator/package.json

@@ -21,10 +21,9 @@
     "commander": "^2.19.0",
     "cors": "^2.8.5",
     "ethereumjs-util": "^6.1.0",
-    "ethereumjs-vm": "3.0.0",
+    "ethereumjs-block": "^2.2.1",
     "express": "^4.16.3",
     "express-ws": "^4.0.0",
-    "fast-async": "^6.3.7",
     "merge": "^1.2.0",
     "remix-lib": "0.4.15",
     "standard": "^10.0.3",