Release 0.2.0

Main new feature is hardening of rules parsing and evaluation. This ensures that untrusted rules can be used, and maliciously formed rules or scanned files cannot trigger crashes or bring deteriorated performances.

In addition, a timeout can be specified during the scan to abort scans that last too long.

Lastly, a few differences with YARA found in corner-case situations have been fixed.

For a more detailed list of changes, see https://github.com/vthib/boreal/blob/master/CHANGELOG.md#020---2023-02-12