more gitversion stuff

GitVersion.yml

@@ -0,0 +1,7 @@
+branches: 
+  v2_develop:
+    mode: ContinuousDelivery
+    regex: v2_develop
+    tag: alpha
+    source-branches: 
+    - v2_develop

Terminal.Gui/Terminal.Gui.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
   <PropertyGroup>
     <!-- Version numbers are automatically updated by gitversion when a release is released -->
-    <!-- In the source tree the version will always be 1.0 for all projects. -->
+    <!-- In the source tree the version will always be 2.0 for all projects. -->
     <!-- Do not modify these. Do NOT commit after manually running `dotnet-gitversion /updateprojectfiles` -->
     <AssemblyVersion>2.0</AssemblyVersion>
     <FileVersion>2.0</FileVersion>