added replication log for msmarco doc
@@ -127,3 +127,4 @@ As expected, BM25 tuning makes a big difference!
## Replication Log
+ Results replicated by [@edwinzhng](https://github.com/edwinzhng) on 2020-01-14 (commit [`3964169`](https://github.com/castorini/anserini/commit/3964169bf82a3783f9298907d9794f0bddf306f0))
++ Results replicated by [@nikhilro](https://github.com/nikhilro) on 2020-01-21 (commit [`631589e`](https://github.com/castorini/anserini/commit/631589e9e08326373f46555e007e6c302c19126d))
