More than 500 bug fixes and enhancements have been made since EF Core 2.0 was released. Because EF Core is developed as an open-source project on GitHub, a complete list of these changes can be found in the GitHub issue tracker:
Changes from 2.1-rc1 to 2.1.0
Changes from 2.1-preview2 to 2.1-rc1
Changes from 2.1-preview1 to 2.1-preview2
Changes from 2.0 to 2.1-preview1
You can read more about this release on the .NET Blog announcement post.
In EF Core 2.1 the dotnet ef command-line tools have been integrated into the .NET Core SDK, but the new versions of the tools cannot be used with EF Core versions older than 2.0. For information on how to install and use dotnet ef tools with different versions of EF Core, see https://go.microsoft.com/fwlink/?linkid=871254.