Steps to create a new version

[SimonG96]

The following steps should be completed before a new version is released:

• Update version number in Properties
• Update version number in AppVeyor settings
• Create GitHub release
  • upload nuget package to release
  • update release notes for release
  • add fixed issues to release notes
• publish nuget package to nuget gallery
• update demo project with new features
• check for more old version numbers