Use github actions badge on readme

[jessedobbelaere]

Type

• Enhancement

Resolves the following issues

Pull request description

Badge still had the Travis badge on the readme

[codecov]

Codecov Report

Merging #3214 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #3214   +/-   ##
=========================================
  Coverage     28.21%   28.21%           
  Complexity     8013     8013           
=========================================
  Files           567      567           
  Lines         30629    30629           
=========================================
  Hits           8642     8642           
  Misses        21987    21987           

Flag	Coverage Δ	Complexity Δ
functional	23.91% <ø> (ø)	8013.00 <ø> (ø)
installer	3.88% <ø> (ø)	8013.00 <ø> (ø)
unit	7.78% <ø> (ø)	8013.00 <ø> (ø)

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