added yarn.lock fixes

package.json

@@ -184,7 +184,7 @@
     "jest": "^19.0.2",
     "jsdom": "^10.1.0",
     "minimist": "^1.2.0",
-    "node-sass": "^4.13.1",
+    "node-sass": "^6.0.1",
     "react-addons-test-utils": "^16.0.0-alpha.3",
     "react-test-renderer": "^16.4.0",
     "redux-logger": "^3.0.6",
@@ -205,7 +205,7 @@
   "dependencies": {
     "@hiveio/hive-js": "^2.0.4",
     "bip39": "^2.6.0",
-    "bufferutil": "^3.0.5",
+    "bufferutil": "^4.0.4",
     "connected-react-router": "^6.6.1",
     "crypto-js": "^3.1.9-1",
     "electron-config": "^1.0.0",
@@ -234,7 +234,7 @@
     "semantic-ui-react": "^0.88.2",
     "source-map-support": "^0.4.18",
     "url-parse": "^1.4.7",
-    "utf-8-validate": "^3.0.1"
+    "utf-8-validate": "^5.0.6"
   },
   "devEngines": {
     "node": ">=6.x",