Fix RuntimeWarning: divide by zero in retracement calculation

[wavebyrd]

Summary

Fix the divide by zero warning in fib_retracements() when top == bottom.

Problem

RuntimeWarning: divide by zero encountered in scalar divide
100 - ((ohlc["high"][i] - top) / (bottom - top)) * 100

Solution

Add a guard to check if the divisor is zero before performing division:

• For bullish direction: check top - bottom != 0
• For bearish direction: check bottom - top != 0

When the divisor is zero, return 0 as the retracement value.

Changes

# Before
100 - ((ohlc["high"].iloc[i] - top) / (bottom - top)) * 100

# After  
divisor = bottom - top
100 - ((ohlc["high"].iloc[i] - top) / divisor) * 100 if divisor != 0 else 0

Fixes #33

🤖 Generated with Claude Code

[wavebyrd]

Hi! Just checking in on this fix for the divide-by-zero warning. Happy to make any adjustments if needed.