[fix] remove redundant code in __init__.py

Author: JerryGJX

block_sparse_attn/__init__.py

@@ -1,14 +1,4 @@
-__version__ = "0.0.1"
-
-from block_sparse_attn.flash_attn_interface import (
-    flash_attn_func,
-    flash_attn_kvpacked_func,
-    flash_attn_qkvpacked_func,
-    flash_attn_varlen_func,
-    flash_attn_varlen_kvpacked_func,
-    flash_attn_varlen_qkvpacked_func,
-    flash_attn_with_kvcache,
-)
+__version__ = "0.0.2"
 
 from block_sparse_attn.block_sparse_attn_interface import (
     block_sparse_attn_func,