Adding the Prefix-Filter to the repository. Another filter called TwoChoicer is added. the TwoChoicer is based on the power of two choices paradigm.

Author: TomerEven

README.md

@@ -86,7 +86,7 @@ The filter implementations are in `src/<type>/`. Most implementations depend on
 
 - [Binary Fuse Filters: Fast and Smaller Than Xor Filters](http://arxiv.org/abs/2201.01174), Journal of Experimental Algorithmics (to appear).
 - [Xor Filters: Faster and Smaller Than Bloom and Cuckoo Filters](https://arxiv.org/abs/1912.08258), Journal of Experimental Algorithmics 25 (1), 2020
-- [Prefix Filter: Practically and Theoretically Better Than Bloom](https://arxiv.org/abs/2203.17139), PVLDB 7, 22 (2023).
+- [Prefix Filter: Practically and Theoretically Better Than Bloom](https://arxiv.org/abs/2203.17139), PVLDB 15(7), 2022.
 
 ## Credit