Remove release dates from the changelog

No need to maintain them here, they are available in GitHub

Author: jeffgbutler

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 This log will detail notable changes to MyBatis Dynamic SQL. Full details are available on the GitHub milestone pages.
 
-## Release 1.1.1 (Unreleased)
+## Release 1.1.1
 
 GitHub milestone: [https://github.com/mybatis/mybatis-dynamic-sql/issues?q=milestone%3A1.1.1+](https://github.com/mybatis/mybatis-dynamic-sql/issues?q=milestone%3A1.1.1+)
 
@@ -19,7 +19,7 @@ GitHub milestone: [https://github.com/mybatis/mybatis-dynamic-sql/issues?q=miles
 - Fixed self joins
 
 
-## Release 1.1.0 - April 24, 2018
+## Release 1.1.0
 
 GitHub milestone: [https://github.com/mybatis/mybatis-dynamic-sql/issues?q=milestone%3A1.1.0+](https://github.com/mybatis/mybatis-dynamic-sql/issues?q=milestone%3A1.1.0+)