Update outdated npm packages (#198)

Author: aydrian

package.json

@@ -26,18 +26,18 @@
   "devDependencies": {
     "chai": "^3.5.0",
     "chai-as-promised": "^6.0.0",
-    "coveralls": "^2.11.12",
-    "eslint": "^3.3.1",
-    "eslint-config-sparkpost": "^1.2.0",
+    "coveralls": "^2.11.15",
+    "eslint": "^3.12.2",
+    "eslint-config-sparkpost": "^1.3.1",
     "istanbul": "^0.4.5",
-    "mocha": "^3.0.2",
+    "mocha": "^3.2.0",
     "nock": "^9.0.0",
     "sinon": "^1.17.5",
     "sinon-as-promised": "^4.0.2",
     "sinon-chai": "^2.8.0"
   },
   "dependencies": {
-    "lodash": "^4.13.1",
-    "request": "^2.74.0"
+    "lodash": "^4.17.2",
+    "request": "^2.79.0"
   }
 }