Updated readme with 1.5

Author: VesaJuvonen

README.md

@@ -16,7 +16,7 @@ You can also tweet / follow [@officedev](https://twitter.com/officedev) or [@off
 
 ## SharePoint Framework Releases
 * **June 5, 2018**
-   * **SPFx v1.5** - Release notes coming soon
+   * **SPFx v1.5** - [See the release notes here](https://github.com/SharePoint/sp-dev-docs/wiki/Release-Notes-for-SharePoint-Framework-Package-v1.5)
 
 * **February 15, 2018**
    * **SPFx v1.4.1** [See the release notes here](https://github.com/SharePoint/sp-dev-docs/wiki/Release-Notes-for-SPFx-Package-Version-1.4.1)