updated path from static to dynamic

Author: ashfaq92

examples/example.py

@@ -45,7 +45,7 @@
 # Serializing and deleting the index:
 index_path='first_half.bin'
 print("Saving index to '%s'" % index_path)
-p.save_index("first_half.bin")
+p.save_index(index_path)
 del p
 
 # Reiniting, loading the index