Tartufo no longer able to scan repositories with GIT submodules

[adifelice-godaddy]

🐛 Bug Report

The method Repository.lookup_submodule from pygit2 was removed (deprecated). But the scanner module is still calling it causing an exception.

Line:

tartufo/tartufo/scanner.py

Line 776 in 345092b

submodule = repo.lookup_submodule(module)

To Reproduce

Scan a repository with GIT submodules.

Expected Behavior

Complete scan.

Code Example

Removing error handler exposes the actual exception:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
AttributeError: 'Repository' object has no attribute 'lookup_submodule'

Environment

Any.