Update Readme.md
Update Readme.md

Remove mention of Visual Studio 2015 RC
Microsoft/ApplicationInsights-aspnetcore,Microsoft/ApplicationInsights-aspnet5,hackathonvixion/ApplicationInsights-aspnet5,gzepeda/ApplicationInsights-aspnetcore,hackathonvixion/ApplicationInsights-aspnet5,gzepeda/ApplicationInsights-aspnetcore,hackathonvixion/ApplicationInsights-aspnet5,Microsoft/ApplicationInsights-aspnet5,Microsoft/ApplicationInsights-aspnet5,gzepeda/ApplicationInsights-aspnetcore,Microsoft/ApplicationInsights-aspnetcore,Microsoft/ApplicationInsights-aspnetcore