Update .NET Standard from 1.3 to 2.0 in README (#3516)
Update .NET Standard from 1.3 to 2.0 in README (#3516)


AzureAD/microsoft-authentication-library-for-dotnet,AzureAD/microsoft-authentication-library-for-dotnet,AzureAD/microsoft-authentication-library-for-dotnet,AzureAD/microsoft-authentication-library-for-dotnet