Add publish to myget step on successful build

[brianpopow]

This will change the github yml to publish to MyGet on successful build

[codecov[bot]]

Codecov Report

Merging #4 (eff0e38) into master (2bfc7a1) will decrease coverage by 44.94%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master       #4       +/-   ##
===========================================
- Coverage   59.52%   14.58%   -44.95%     
===========================================
  Files         142      142               
  Lines        5189     5189               
  Branches      386      386               
===========================================
- Hits         3089      757     -2332     
- Misses       2019     4401     +2382     
+ Partials       81       31       -50     

Flag	Coverage Δ
unittests	14.58% <ø> (-44.95%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...c/ImageSharp.Textures/Common/Helpers/PixelUtils.cs	0.00% <0.00%> (-100.00%)	:arrow_down:
...harp.Textures/PixelFormats/ColorSpaceConversion.cs	0.00% <0.00%> (-100.00%)	:arrow_down:
...rp.Textures/TextureFormats/Decoding/Bc7ModeInfo.cs	0.00% <0.00%> (-100.00%)	:arrow_down:
...p.Textures/TextureFormats/Decoding/Bc6hModeInfo.cs	0.00% <0.00%> (-100.00%)	:arrow_down:
....Textures/TextureFormats/Decoding/Bc6hsModeInfo.cs	0.00% <0.00%> (-100.00%)	:arrow_down:
...ures/TextureFormats/Decoding/Bc6hModeDescriptor.cs	0.00% <0.00%> (-100.00%)	:arrow_down:
...res/TextureFormats/Decoding/Bc6hsModeDescriptor.cs	0.00% <0.00%> (-100.00%)	:arrow_down:
.../TextureFormats/Decoding/PixelFormats/Constants.cs	0.00% <0.00%> (-100.00%)	:arrow_down:
...tureFormats/Decoding/PixelFormats/IntEndPntPair.cs	0.00% <0.00%> (-100.00%)	:arrow_down:
...mageSharp.Textures/TextureFormats/Decoding/Dxt3.cs	4.34% <0.00%> (-95.66%)	:arrow_down:
... and 69 more

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