.NET 4.5 doesn't automatically use TLS 1.2

[ronc90]

With Freightview's hosting platform now requiring TLS1.2, the FV C# sample API integration doesn't work without forcing
the connection to use TLS1.2.

Long-term solution: update code to use a more modern version of .net framework.

Short-term fix: force TLS1.2

add this line:

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

in ApiClient.cs, like this:

public class ApiClient
	{
		public List<MediaTypeFormatter> formatters { get; private set; }
		public ApiClient(HttpClient apiClient)
		{
			this.Client = apiClient;
			this.formatters = new List<MediaTypeFormatter>();
			this.formatters.Add(new JsonMediaTypeFormatter() {SerializerSettings = new Newtonsoft.Json.JsonSerializerSettings() { NullValueHandling = NullValueHandling.Ignore}});
			this.formatters.Add(new XmlMediaTypeFormatter());
                        System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; //this line added to force TLS1.2
		}