Use Timestamp in Date fields (#33)

Author: samtstern

firestore/main/index.js

@@ -179,7 +179,7 @@ function dataTypes(db) {
     stringExample: 'Hello, World!',
     booleanExample: true,
     numberExample: 3.14159265,
-    dateExample: new Date('December 10, 1815'),
+    dateExample: admin.firestore.Timestamp.fromDate(new Date('December 10, 1815')),
     arrayExample: [5, true, 'hello'],
     nullExample: null,
     objectExample: {

firestore/main/package.json

@@ -10,8 +10,8 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "@google-cloud/firestore": "^0.19.0",
-    "firebase-admin": "^6.4.0"
+    "@google-cloud/firestore": "^0.21.0",
+    "firebase-admin": "^6.5.1"
   },
   "devDependencies": {
     "mocha": "^3.3.0"