update to verify v4

Author: SimonCropp

src/Directory.Build.props

@@ -2,7 +2,7 @@
 <Project>
   <PropertyGroup>
     <NoWarn>CS1591;CS0649</NoWarn>
-    <Version>2.0.0</Version>
+    <Version>2.1.0</Version>
     <AssemblyVersion>1.0.0</AssemblyVersion>
     <PackageTags>ImageSharp, Verify</PackageTags>
     <Description>Extends Verify (https://github.com/VerifyTests/Verify) to allow verification via ImageSharp (https://github.com/SixLabors/ImageSharp).</Description>

src/Tests/Tests.csproj

@@ -11,7 +11,7 @@
     <PackageReference Include="Xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
     <PackageReference Include="XunitContext" Version="1.9.3" />
-    <PackageReference Include="Verify.Xunit" Version="3.1.0" />
+    <PackageReference Include="Verify.Xunit" Version="4.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.1" />
     <PackageReference Include="ProjectDefaults" Version="1.0.42" PrivateAssets="All" />
     <ProjectReference Include="..\Verify.ImageSharp\Verify.ImageSharp.csproj" />

src/Verify.ImageSharp/Verify.ImageSharp.csproj

@@ -4,7 +4,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="SixLabors.ImageSharp" Version="1.0.0-rc0001" />
-    <PackageReference Include="Verify" Version="3.1.0" />
+    <PackageReference Include="Verify" Version="4.0.0" />
     <PackageReference Include="ProjectDefaults" Version="1.0.42" PrivateAssets="All" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" Condition="$(Configuration) == 'Release'" />
   </ItemGroup>