Timestamp builder for Angular build facade

This builder is an example from the Medium article Angular CLI under the hood — builders demystified.

Usage

In the root of your Angular application:
```
npm i -D @angular-builders/timestamp
```

In your angular.json add the following to architect section of the relevant project:

"timestamp": {
  "builder": "@angular-builders/timestamp:file",
  "options": {}
},

Run: ng run [relevant-project]:timestamp Where [relevant-project] is the project to which you've added the target