Merge pull request #4231 from MetaMask/fix-nodesecurity

Fix Node Security vulnerability warnings

.nsprc

@@ -1,3 +1,6 @@
 {
-  "exceptions": ["https://nodesecurity.io/advisories/566"]
+  "exceptions": [
+    "https://nodesecurity.io/advisories/566",
+    "https://nodesecurity.io/advisories/157"
+  ]
 }

package.json

@@ -81,7 +81,7 @@
     "currency-formatter": "^1.4.2",
     "debounce": "^1.0.0",
     "debounce-stream": "^2.0.0",
-    "deep-extend": "^0.5.0",
+    "deep-extend": "^0.5.1",
     "detect-node": "^2.0.3",
     "disc": "^1.3.2",
     "dnode": "^1.2.2",