v2.7.0

Minor release changes

• Add ability for developers to support additional MIME types in FileMiddleware. PR #657 from @mredig

Patch release changes

• Fix iOS build: NIOTSEventLoopGroup's module is not imported. PR #659 from @millenomi

Other changes

• Show URLFormCoding test case errors in test case. PR #658 from @mredig
• Add test verifying connection is closed if error thrown in response body writer. PR #