Update dependencies

Author: codenirvana

Diff for: package.json

@@ -33,7 +33,7 @@
     "combined-stream": "~1.0.6",
     "extend": "~3.0.2",
     "forever-agent": "~0.6.1",
-    "http-signature": "~1.3.1",
+    "http-signature": "~1.4.0",
     "is-typedarray": "~1.0.0",
     "isstream": "~0.1.2",
     "json-stringify-safe": "~5.0.1",
@@ -67,17 +67,12 @@
     "karma-cli": "^1.0.0",
     "karma-coverage": "^1.0.0",
     "karma-tap": "^3.0.1",
-    "postman-url-encoder": "^2.1.0-beta.3",
+    "postman-url-encoder": "^3.0.6",
     "puppeteer": "^1.20.0",
     "rimraf": "^2.2.8",
     "server-destroy": "^1.0.1",
     "standard": "^9.0.0",
     "tape": "^4.6.0",
     "taper": "^0.5.0"
-  },
-  "greenkeeper": {
-    "ignore": [
-      "har-validator"
-    ]
   }
 }