Lower minimum git versions a bit more

Author: shana

src/GitHub.Api/Helpers/Constants.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace GitHub.Unity
 {
     static class Constants
@@ -21,7 +19,9 @@ static class Constants
         public const string SkipVersionKey = "SkipVersion";
         public const string GitInstallationState = "GitInstallationState";
 
-        public static readonly TheVersion MinimumGitVersion = TheVersion.Parse("2.11");
+        public static readonly TheVersion MinimumGitVersion = TheVersion.Parse("2.0");
         public static readonly TheVersion MinimumGitLfsVersion = TheVersion.Parse("2.0");
+        public static readonly TheVersion DesiredGitVersion = TheVersion.Parse("2.11");
+        public static readonly TheVersion DesiredGitLfsVersion = TheVersion.Parse("2.4");
     }
 }