Add mixin (#469)

Author: NielsRogge

mamba_ssm/modules/mamba2.py

@@ -31,8 +31,10 @@
 from mamba_ssm.ops.triton.ssd_combined import mamba_chunk_scan_combined
 from mamba_ssm.ops.triton.ssd_combined import mamba_split_conv1d_scan_combined
 
+from huggingface_hub import PyTorchModelHubMixin
 
-class Mamba2(nn.Module):
+
+class Mamba2(nn.Module, PyTorchModelHubMixin):
     def __init__(
         self,
         d_model,