remove untested, unsupported versions

Author: lowlydba

docs/README.md

@@ -43,8 +43,6 @@ Tested against versions that are still in an extended support lifecycle.
 | SQL Server 2022 | :heavy_check_mark: |
 | SQL Server 2019 | :heavy_check_mark: |
 | SQL Server 2017 | :heavy_check_mark: |
-| SQL Server 2016 | :heavy_check_mark: |
-| SQL Server 2014 | :heavy_check_mark: |
 | <= SQL Server 2012 | :x: |
 
 \* AWS RDS SQL Server is not tested, but should work *in theory*. YMMV.