License classifier v2.0

This is the 2.0. release of the license classifier.

This version of the license classifier is more accurate and faster than the 1.0 version, and includes a larger corpus of licenses.

The classifier also features an io.Reader API so it's possible to scan larger files without the need to read them into memory.

Please see the v2/README.md file for more details.

v2.0.0-pre6: Fix runtime panic on LoadLicenses()

It may be possible that the amount of segments is lower than 3 which
caused a runtime panic in the license loader. We now skip those paths to
fix that issue.

Found: https://github.com/cri-o/cri-o/runs/7037925519

Signed-off-by: Sascha Grunert <[email protected]>