(#201) Correcting uninstallation
(#201) Correcting uninstallation

Rather than make a direct call to msiexec, use the Chocolatey Helper Method, which should handle waiting on the MSI to complete the uninstallation, and then carry on with writing Chocolatey success message.
gep13/ChocolateyGUI,gep13/ChocolateyGUI,chocolatey/ChocolateyGUI,chocolatey/ChocolateyGUI,gep13/ChocolateyGUI,dlsteuer/ChocolateyGUI,sayedihashimi/ChocolateyGUI,gep13/ChocolateyGUI,RichiCoder1/ChocolateyGUI,chocolatey/ChocolateyGUI,alephnaughty/ChocolateyGUI,chocolatey/ChocolateyGUI,gep13/ChocolateyGUI,paladique/ChocolateyGUI,chocolatey/ChocolateyGUI,wjk/ChocolateyGUI,digital-carver/ChocolateyGUI,M-Zuber/ChocolateyGUI,paladique/ChocolateyGUI