Publish 'dev' builds on MyGet

[CharliePoole]

Whenever a new feature or fix is merged to master, we should publish pre-release packages using the 'dev' label on MyGet.

[CharliePoole]

Fixed as part of #42

[CharliePoole]

🎉 This issue has been resolved in version 3.9.0 🎉

The release is available on:

• GitHub Release
• NuGet Package
• Chocolatey Package