added -alpha to the version to make nuget see it as a prerelease.

Rick van Dam · Rick van Dam · commit 3e6ee6533d82 · 2018-04-06T12:08:10.000+02:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 2.3.0.{build}
+version: 2.3.0.{build}-alpha
 image: Visual Studio 2017
 configuration: Release
 shallow_clone: true
