Expose method needed by test.

src/bloom_filter/__init__.py

@@ -3,10 +3,12 @@
 
 from .bloom_filter import (
     BloomFilter,
+    get_bitno_lin_comb,
     get_bitno_seed_rnd,
 )
 
 __all__ = [
     'BloomFilter',
+    'get_bitno_lin_comb',
     'get_bitno_seed_rnd',
 ]