(GH-241) Corrected nupkg asset addition
(GH-241) Corrected nupkg asset addition

- Ran into a similar issue on GitHubReleaseManager, so making sure to
correctly convert the full path to the nupkg packages, before passing to
GitHubReleaseManager for upload

gep13/ChocolateyGUI,alephnaughty/ChocolateyGUI,dlsteuer/ChocolateyGUI,paladique/ChocolateyGUI,gep13/ChocolateyGUI,paladique/ChocolateyGUI,digital-carver/ChocolateyGUI,chocolatey/ChocolateyGUI,chocolatey/ChocolateyGUI,gep13/ChocolateyGUI,chocolatey/ChocolateyGUI,M-Zuber/ChocolateyGUI,chocolatey/ChocolateyGUI,gep13/ChocolateyGUI,gep13/ChocolateyGUI,wjk/ChocolateyGUI,chocolatey/ChocolateyGUI,sayedihashimi/ChocolateyGUI,RichiCoder1/ChocolateyGUI