add sendgrind-transport dependency

package.json

@@ -36,6 +36,7 @@
     "morgan": "*",
     "mustache": "^2.1.0",
     "nodemailer": "^1.3.4",
+    "nodemailer-sendgrid-transport": "^0.2.0",
     "npmlog": "^0.1.1",
     "preconditions": "^1.0.7",
     "read": "^1.0.5",
@@ -65,14 +66,18 @@
     "coveralls": "./node_modules/.bin/istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage"
   },
   "bitcoreNode": "./bitcorenode",
-  "contributors": [{
+  "contributors": [
+    {
       "name": "Braydon Fuller",
       "email": "braydon@bitpay.com"
-  }, {
+    },
+    {
       "name": "Ivan Socolsky",
       "email": "ivan@bitpay.com"
-  }, {
+    },
+    {
       "name": "Matias Alejo Garcia",
       "email": "ematiu@gmail.com"
-  }]
+    }
+  ]
 }