Pass args to background

[pkulev]

Closes issue(s): [ ]

Description of the changes:

• What's new:
• Fixes:
• Refactoring: pass args to Background.init, update PR template

Reviewers: [ @taptap ]

Task list:

• [x] submit pull request
• [ ] review
• [ ] testing
• [ ] fixes after review, squashing, rebasing to master

[codecov-io]

Codecov Report

Merging #57 into master will increase coverage by 0.05%. The diff coverage is 80%.

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
+ Coverage   62.39%   62.45%   +0.05%     
==========================================
  Files          40       40              
  Lines        2085     2083       -2     
==========================================
  Hits         1301     1301              
+ Misses        784      782       -2

Impacted Files	Coverage Δ
xoinvader/ingame.py	0% <0%> (ø)	:white_check_mark:
xoinvader/background.py	100% <100%> (ø)	:white_check_mark:

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