Automatic upload to DockerHub

[AngryMaciek]

Description

Fixes #22

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have not reduced the existing code coverage

[codecov-io]

Codecov Report

Merging #23 (fcf6b4e) into master (54406cf) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #23   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           10        10           
=========================================
  Hits            10        10           

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