fixed spell

I fixed the spelling because it didn't work~ (crying)

README.md

@@ -156,7 +156,7 @@ All of which are optional except `type` with very logical default values.
 
 ### MongoDB
 
-To use mongodb storage you must install the 'mongodb' pachage in npm
+To use mongodb storage you must install the 'mongodb' package in npm
 
 `npm install mongodb`
 
@@ -164,7 +164,7 @@ Once you've done that, your config section should look like:
 
 ``` json
 {
-  "type": "mongodb",
+  "type": "mongo",
   "connectionUrl": "mongodb://localhost:27017/database"
 }
 ```