Replaced 'all' flag with 'tags' flag

Author: ThomasAunvik

src/GitHub.Api/Git/Tasks/GitFetchTask.cs

@@ -10,21 +10,21 @@ class GitFetchTask : ProcessTask<string>
         private readonly string arguments;
 
         public GitFetchTask(string remote,
-            CancellationToken token, bool all = false, bool prune = false, IOutputProcessor<string> processor = null)
+            CancellationToken token, bool tags = false, bool prune = false, IOutputProcessor<string> processor = null)
             : base(token, processor ?? new SimpleOutputProcessor())
         {
             Name = TaskName;
             var stringBuilder = new StringBuilder();
             stringBuilder.Append("fetch");
-
-            if (all)
+            
+            if (prune)
             {
-                stringBuilder.Append(" --all");
+                stringBuilder.Append(" -p");
             }
 
-            if (prune)
+            if (tags)
             {
-                stringBuilder.Append(" -p");
+                stringBuilder.Append(" --tags");
             }
 
             if (!String.IsNullOrEmpty(remote))