Update CHANGELOG.md in preparation for release

Author: realityforge

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Change Log
 
-### Unreleased
+### [v1.74](https://github.com/react4j/react4j-windowportal/tree/v1.74) (2019-07-15)
+[Full Changelog](https://github.com/react4j/react4j-windowportal/compare/v1.73...v1.74)
 
 * Update the 'org.realityforge.react4j' dependencies to version '0.132'
 * Upgrade the `au.com.stocksoftware.idea.codestyle` artifact to version `1.14`.