Remove redundant ctors

Octokit/Models/Request/CommitRequest.cs

@@ -7,10 +7,6 @@ namespace Octokit
     [DebuggerDisplay("{DebuggerDisplay,nq}")]
     public class CommitRequest : RequestParameters
     {
-        public CommitRequest()
-        {
-        }
-
         /// <summary>
         /// SHA or branch to start listing commits from.
         /// </summary>

Octokit/Models/Request/SearchRepositoriesRequest.cs

@@ -16,7 +16,6 @@ namespace Octokit
     public class SearchRepositoriesRequest : BaseSearchRequest
     {
         public SearchRepositoriesRequest()
-            : base()
         {
             Order = SortDirection.Descending;
         }