Implemented pain.008.003.02 transactions without BIC

[alphanoob1337]

Added support for payment information and configuration without BIC for pain.008.003.02 scheme.

[raphaelm]

Thanks a lot! Can you resolve the two style issues?

sepaxml/debit.py:456:1: W293 blank line contains whitespace

tests/test_no_bic_00800302.py:15:9: E265 block comment should start with '# '

[codecov]

Codecov Report

Merging #25 into master will decrease coverage by 0.57%.
The diff coverage is 82.85%.

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
- Coverage    97.3%   96.73%   -0.58%     
==========================================
  Files          22       23       +1     
  Lines         854      888      +34     
==========================================
+ Hits          831      859      +28     
- Misses         23       29       +6

Impacted Files	Coverage Δ
tests/test_no_bic_00800302.py	100% <100%> (ø)
sepaxml/debit.py	95.89% <70%> (-1.76%)	⬇️

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