chore(package): update web3 to version 1.2.1

Closes #395

Author: greenkeeper[bot]

package.json

@@ -76,7 +76,7 @@
     "tslint-sonarts": "1.9.0",
     "typemoq": "2.1.0",
     "typescript": "3.3.3",
-    "web3": "1.0.0-beta.36",
+    "web3": "1.2.1",
     "websocket": "1.0.28"
   },
   "nyc": {