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Make CI enforce that help output is up to date in README (#1449)

Inspired by #1429 this PR adds a step to the travis config that makes sure we have the exact output of `cargo run --bin driver -- --help\` in the README.

This is done by diffing the output of the command and content of README.md and making sure that README only contains additions.

### Test Plan
```sh
git checkout contracts_4.3
! diff README.md <(cargo run --bin driver -- --help) | grep -E "^>" || (echo "[ERROR] README doesn't contain output of \`cargo run --bin driver -- --help\`"; false)
```

outputs 

```sh
  Finished dev [unoptimized + debuginfo] target(s) in 0.22s
  Running `target/debug/driver --help`
>     driver [OPTIONS] --node-url <node-url> --private-key <private-key>
[ERROR] README doesn't contain output of `cargo run --bin driver -- --help`
```

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