Standardize changelog dates

CHANGELOG.md

@@ -6,32 +6,32 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
-## [2.0.0](https://github.com/cyberark/conjur-api-java/releases/tag/v2.0.0) - 2018-7-12
+## [2.0.0](https://github.com/cyberark/conjur-api-java/releases/tag/v2.0.0) - 2018-07-12
 ### Added
 - License updated to Apache v2 - [PR #8](https://github.com/cyberark/conjur-api-java/pull/8)
 ### Changed
 - Authn tokens now use the new Conjur 5 format - [PR #21](https://github.com/cyberark/conjur-api-java/pull/21)
 - Configuration change. When using environment variables, use `CONJUR_AUTHN_LOGIN` and `CONJUR_AUTHN_API_KEY` now
     instead of `CONJUR_CREDENTIALS` - https://github.com/cyberark/conjur-api-java/commit/60344308fc48cb5380c626e612b91e1e720c03fb
 
-## [1.4.0] - 2015-5-15
+## [1.4.0] - 2015-05-15
 ### Changed
 - Remove non-JAXRS usage to allow users to provide their own implementation of the standard.
 - Handle JSON with Gson
 
-## [1.3.0] - 2015-4-16
+## [1.3.0] - 2015-04-16
 ### Changed
 - Change variable behavior to reflect the fact that you may not have 'read' permission on 
 a variable that you can 'execute' or 'update'.
 - Allow SSL hostname verification to be disabled in order to facilitate development and debugging.
 
-## [1.2.0] - 2015-4-15
+## [1.2.0] - 2015-04-15
 ### Changed
 - Fix appliance endpoints bug
 - deprecate Endpoints.of
 - expose Endpoints constructors.
 
-## [0.9.0] - 2018-7-11
+## [0.9.0] - 2018-07-11
 ### Changed
 - Adds CIDR restrictions to Host and User resources
 - Adds Kubernete authentication