some versions updates

package.json

@@ -111,8 +111,8 @@
     "buildweb": "node src/background/webpack.js"
   },
   "dependencies": {
-    "bencode": "^1.0.0",
-    "bitfield": "^1.1.2",
+    "bencode": "^2.0.0",
+    "bitfield": "^2.0.0",
     "compare-versions": "^3.1.0",
     "debug": "^3.1.0",
     "electron-context-menu": "^0.9.1",
@@ -151,7 +151,7 @@
     "babel-plugin-transform-object-rest-spread": "^7.0.0-beta.3",
     "chai": "^4.1.2",
     "css-loader": "^0.28.11",
-    "electron": "2.0.2",
+    "electron": "2.0.3",
     "electron-builder": "^20.15.1",
     "eslint": "^4.19.1",
     "eslint-plugin-react": "^7.9.1",