[build] prep for a prerelease targeting XF 4.0 (#33)

* [build] prep for a prerelease targeting XF 4.0

Let's also create build artifacts on AppVeyor of the nupkg files

[appveyor] we need to *package* the NuGet

Author: jonathanpeppers

README.md

@@ -163,6 +163,7 @@ Make sure to choose the appropriate version of this package for the version of X
 
 | Xamarin.Forms  | Xamarin.Forms.Mocks |
 | -------------- | ------------------- |
+| 4.0.0.x        | 4.0.0.x             |
 | 3.0.0.x        | 3.0.0.x             |
 | 2.5.0.x        | 2.5.0.x             |
 | 2.4.0.x        | 2.4.0.x             |

Xamarin.Forms.Mocks.nuspec

@@ -15,7 +15,7 @@
       <releaseNotes>Upgraded to netstandard2.0</releaseNotes>
       <tags>Xamarin, Xamarin.Forms, Mocks, Unit Testing</tags>
       <dependencies>
-         <dependency id="Xamarin.Forms" version="3.0.0.446417" />
+         <dependency id="Xamarin.Forms" version="4.0.0.8055-pre1" />
       </dependencies>
    </metadata>
 </package>

appveyor.yml

@@ -1,4 +1,7 @@
 version: '{build}'
 image: Visual Studio 2017
 build_script:
-- ps: .\build.ps1 -t Build
+- ps: .\build.ps1 -t NuGet-Package
+artifacts:
+- path: build
+  name: Xamarin.Forms.Mocks

build.cake

@@ -16,8 +16,8 @@ var dirs = new[]
     Directory("./Xamarin.Forms.Mocks.Xaml/obj") + Directory(configuration),
 };
 string sln = "./Xamarin.Forms.Mocks.sln";
-string version = "3.0.0.2";
-string suffix = "";
+string version = "4.0.0.0";
+string suffix = "-pre1";
 
 Task("Clean")
     .Does(() =>