Bump MaterialDesignColors from 2.0.1 to 2.0.6 in /src (#56)

Bumps [MaterialDesignColors](https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit) from 2.0.1 to 2.0.6.
- [Release notes](https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/releases)
- [Commits](https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/commits)

---
updated-dependencies:
- dependency-name: MaterialDesignColors
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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src/Camelotia.Presentation.Wpf/Camelotia.Presentation.Wpf.csproj

@@ -11,7 +11,7 @@
   <ItemGroup>
     <PackageReference Include="akavache" Version="7.3.1" />
     <PackageReference Include="MahApps.Metro" Version="2.4.7" />
-    <PackageReference Include="MaterialDesignColors" Version="2.0.1" />
+    <PackageReference Include="MaterialDesignColors" Version="2.0.6" />
     <PackageReference Include="MaterialDesignThemes" Version="4.1.0" />
     <PackageReference Include="MaterialDesignThemes.MahApps" Version="0.1.7" />
     <PackageReference Include="ReactiveUI.WPF" Version="18.1.8" />