Add date to changelog

Author: javierbrea

CHANGELOG.md

@@ -13,7 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Fixed
 ### Removed
 
-## [1.0.0] - 
+## [1.0.0] - 2019-12-06
 - Migrate administration api from [@mocks-server/main, v1.3.0](https://github.com/mocks-server/main/releases/tag/v1.3.0). For further info read the [previous repository CHANGELOG.md](https://github.com/mocks-server/main/blob/v1.3.0/CHANGELOG.md#130---2019-11-17)
 - Export Plugin, which can be used only programmatically. (Binary is still distributed in the [@mocks-server/main](https://github.com/mocks-server/main) package).
 - Remove core and inquirer-cli. Both have now their own repositories.