be more strict when crawling the stack

[wimglenn]

additionally require that the line text in the stack frame contains "aocd" as a substring. should rule out false positives like in #92

[codecov]

Codecov Report

Merging #93 (edfc9f6) into main (e66f0fe) will decrease coverage by 0.54%.
The diff coverage is 76.92%.

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
- Coverage   93.36%   92.81%   -0.55%     
==========================================
  Files          24       25       +1     
  Lines        2094     2143      +49     
  Branches      266      272       +6     
==========================================
+ Hits         1955     1989      +34     
- Misses        111      125      +14     
- Partials       28       29       +1     

Impacted Files	Coverage Δ
aocd/_ipykernel.py	22.22% <22.22%> (ø)
aocd/get.py	96.93% <94.44%> (-0.77%)	⬇️
aocd/__init__.py	100.00% <100.00%> (ø)
aocd/version.py	100.00% <100.00%> (ø)
tests/test_aocd.py	100.00% <100.00%> (ø)
tests/test_date_introspection.py	100.00% <100.00%> (ø)

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