Bug fix for: #10 small issue in correct baseline method

[gchure]

This fixes the bug identified in #10 and improves the test dataset for fitting many peaks.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (8ce5223) 97.06% compared to head (24a56b3) 97.06%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #11 +/- ## ======================================= Coverage 97.06% 97.06% ======================================= Files 3 3 Lines 545 545 ======================================= Hits 529 529 Misses 16 16 ```

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