Update travis YML to run coverage

[codders]

No description provided.

[codecov-io]

Codecov Report

Merging #2 into master will increase coverage by 14.82%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master       #2       +/-   ##
===========================================
+ Coverage   35.42%   50.24%   +14.82%     
===========================================
  Files           8        7        -1     
  Lines         415      408        -7     
  Branches       47       47               
===========================================
+ Hits          147      205       +58     
+ Misses        261      195       -66     
- Partials        7        8        +1     

Impacted Files	Coverage Δ
flathunter/sender_telegram.py	87.50% <100.00%> (+87.50%)	⬆️
flathunter/crawl_ebaykleinanzeigen.py	60.86% <0.00%> (+0.57%)	⬆️
flathunter/crawl_immowelt.py	56.52% <0.00%> (+0.63%)	⬆️
flathunter/crawl_wggesucht.py	63.63% <0.00%> (+0.67%)	⬆️
flathunter/idmaintainer.py	89.47% <0.00%> (+89.47%)	⬆️

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