remove unused packages

package.json

@@ -41,9 +41,6 @@
     "change-case": "^3.0.1",
     "colors": "^1.1.2",
     "commander": "^2.13.0",
-    "ethereumjs-util": "^5.1.5",
-    "ethereumjs-vm": "^2.3.2",
-    "remix-lib": "latest",
     "remix-solidity": "latest",
     "remix-simulator": "latest",
     "standard": "^10.0.3",