Use ITraktSyncCollectionRemovePost instead of ITraktSyncCollectionPost in TraktSyncModule.RemoveCollectionItemsAsync()

[henrikfroehling]

API Change:

namespace TraktNet.Modules
{
    public class TraktSyncModule : ATraktModule
    {
-        public Task<TraktResponse<ITraktSyncCollectionRemovePostResponse>> RemoveCollectionItemsAsync(ITraktSyncCollectionPost collectionRemovePost,
+        public Task<TraktResponse<ITraktSyncCollectionRemovePostResponse>> RemoveCollectionItemsAsync(ITraktSyncCollectionRemovePost collectionRemovePost,
    }
}