bug: TREC 2020 qrel_binary.json, score 1 should be treated as negative instead of positive

Hi, 

For TREC, 0,1 are negative, 2,3 are positive. However, in qrel_binary.json, 1 is mapped to positive (1). For instance, in `qrel.json`:

```
{"23849": {"1020327": 2, "1034183": 3, "1120730": 0, "1139571": 1
```
in `qrel_binary.json`:

```
{"23849": {"1020327": 1, "1034183": 1, "1120730": 0, "1139571": 1,
```

doc `1139571` should be mapped to `0` in `qrel_binary.json`.