fixed typo in README

I used this readme a few times to copy and paste the example, and every time I was surprised that it seemingly didn't work :)

Author: lgandecki

README.md

@@ -104,7 +104,7 @@ You can then get the data:
 let item = {
   id: 123,
   status: 'active',
-  date_added: '2019-04-24'
+  date_added: '2020-04-24'
 }
 
 // Use the 'get' method of Customer
@@ -1261,4 +1261,4 @@ let results = await MyEntity.update(item, {}, {
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 ## Contributions and Feedback
-Contributions, ideas and bug reports are welcome and greatly appreciated. Please add [issues](https://github.com/jeremydaly/dynamodb-toolbox/issues) for suggestions and bug reports or create a pull request. You can also contact me on Twitter: [@jeremy_daly](https://twitter.com/jeremy_daly).
+Contributions, ideas and bug reports are welcome and greatly appreciated. Please add [issues](https://github.com/jeremydaly/dynamodb-toolbox/issues) for suggestions and bug reports or create a pull request. You can also contact me on Twitter: [@jeremy_daly](https://twitter.com/jeremy_daly).