Add exclude feature and refactoring

[mordax7]

This merge will add:

• add option to exclude flats from being sent via regex
• refactoring
• fixed unreachable log statement

[codecov-commenter]

Codecov Report

Merging #3 into master will decrease coverage by 1.31%.
The diff coverage is 32.35%.

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
- Coverage   50.24%   48.92%   -1.32%     
==========================================
  Files           7        7              
  Lines         408      419      +11     
  Branches       47       49       +2     
==========================================
  Hits          205      205              
- Misses        195      206      +11     
  Partials        8        8              

Impacted Files	Coverage Δ
flathunter/hunter.py	0.00% <0.00%> (ø)
flathunter/sender_telegram.py	87.50% <ø> (ø)
flathunter/crawl_immobilienscout.py	51.51% <27.27%> (ø)
flathunter/crawl_wggesucht.py	63.63% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 558c9e0...e66d019. Read the comment docs.

[codders]

Looks good to me - thank you!