Merge pull request toddams#349 from toddams/fix/348

Fixes toddams#348

Update README to use README.source.md

Simon Cropp set this up for me a few months ago but I forgot about it and was hastily updating the README.md file instead.  Oops!  This puts back Simon's good work/efforts.

Release 2.0.0-beta7

Publish 2.0.0-beta6

Merge pull request toddams#329 from chancie86/issue287

Fixes toddams#287: Layout not rendered when using await IncludeAsync using .NET Core 3

.NET Core 3.1 support

snupkg, interface fixes

Approximate tag based on .NET Core 3.0 support.

Fixes toddams#284

Also cleaned up xmldoc

Bump version