* drop mentions of net45 from core
* Bump System.Reactive from 3.1.0 to 4.3.2
Bumps [System.Reactive](https://github.com/dotnet/reactive) from 3.1.0 to 4.3.2.
- [Release notes](https://github.com/dotnet/reactive/releases)
- [Commits](https://github.com/dotnet/reactive/compare/v3.1.0...rxnet-v4.3.2)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
* upgrade from net452 to net46 in test projects
* drop netstandard1.1 support
* correct this test reference
* add necessary dependency for test project
* add new dependency needed for integration tests
* upload net462 code coverage
* upgrade environment for validating linqpad examples
* bump linqpad to latest 5.x release
Co-authored-by: Brendan Forster <brendan@github.com>
