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travis-pro

parallelize historic trades script (#1231)

This PR is a followup to #1229 where the `historic_trades` script is also parallelized.

### Test Plan

Before :turtle: `33.93 min`
```
$ time -p target/release/historic_trades --orderbook-file target/orderbook.mainnet.bin  
55415 / 55415 [=============================================] 100.00 % 27.23/s
Processed 88306 orders: 92.99% correct, 2.10% failed, 4.91% skipped.
real 2035.79
user 2012.65
sys 18.42
```

After :rabbit2: `8.48 min`
```
$ time -p target/release/historic_trades --orderbook-file target/orderbook.mainnet.bin
55422 / 55422 [============================================] 100.00 % 109.16/s
Processed 88306 orders: 92.98% correct, 2.10% failed, 4.92% skipped.
real 508.52
user 3951.13
sys 10.13
```

11682 of 46740 branches covered (24.99%)

Branch coverage included in aggregate %.

3101 of 4960 relevant lines covered (62.52%)

12250.41 hits per line