(GH-1178) Fix: OS_NAME not reported as Windows 10

According to
https://msdn.microsoft.com/en-us/library/windows/desktop/ms724832.aspx,
Windows 10 and Windows Server 2016 are created as 10.0 and not 6.4.
However it is thought that 6.4 was an original value for some early
Windows 10 builds, so keep it set. Add a fix for 10.0 to show Windows
10 / Windows Server 2016 appropriately.

src/chocolatey/infrastructure/platforms/Platform.cs

@@ -118,8 +118,11 @@ private static string get_windows_name(Version version)
             string majorMinor = version.Major + "." + version.Minor;
             switch (majorMinor)
             {
+                case "10.0":
+                    name = isServer ? "Windows Server 2016" : "Windows 10";
+                    break;
                 case "6.4":
-                    name = isServer ? "Windows Server 2016 (?)" : "Windows 10";
+                    name = isServer ? "Windows Server 2016" : "Windows 10";
                     break;
                 case "6.3":
                     name = isServer ? "Windows Server 2012 R2" : "Windows 8.1";