allow CLI args to work w/ --resume-from

[epi052]

closes #151

Branching checklist

• There is an issue associated with your PR (bug, feature, etc.. if not, create one)
• Your PR description references the associated issue (i.e. fixes #123456)
• Code is in its own branch
• Branch name is related to the PR contents
• PR targets master

Static analysis checks

• All rust files are formatted using cargo fmt
• All clippy checks pass when running cargo clippy --all-targets --all-features -- -D warnings -A clippy::deref_addrof
• All existing tests pass

Documentation

• New code is documented using doc comments
• Documentation about your PR is included in the README, as needed

Additional Tests

• New code is unit tested
• New code is integration tested, as needed
• New tests pass

[codecov]

Codecov Report

Merging #150 (3caa8d2) into master (6c779bd) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #150      +/-   ##
==========================================
+ Coverage   93.32%   93.37%   +0.05%     
==========================================
  Files          13       13              
  Lines        2561     2583      +22     
==========================================
+ Hits         2390     2412      +22     
  Misses        171      171              

Impacted Files	Coverage Δ
src/main.rs	91.80% <ø> (ø)
src/parser.rs	100.00% <ø> (ø)
src/scan_manager.rs	86.25% <ø> (ø)
src/config.rs	96.95% <100.00%> (+0.13%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6c779bd...3caa8d2. Read the comment docs.