Fix: Correct assignment bug in check_troughs

[sejalpunwatkar]

Closes #88

This PR fixes a small bug in the check_troughs function where the final trough was not being correctly assigned due to a == comparison instead of =. No other functionality has been changed.

Proposed Changes

• Fixed the assignment bug in all_troughs[-1] line in check_troughs function
• Ensured the function now correctly handles the final trough assignment
• No other code changes or logic updates were made

Change Type

• bugfix (+0.0.1)
• minor (+0.1.0)
• major (+1.0.0)
• refactoring (no version update)
• test (no version update)
• infrastructure (no version update)
• documentation (no version update)
• other

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