(#72) Remove information about icon

This will be automatically populated by the CakeContrib.Guidelines
package when the package is created, so we don't need this information
directly in the csproj file anymore.

Source/Cake.Coveralls/Cake.Coveralls.csproj

@@ -17,8 +17,6 @@
       <Authors>Gary Ewan Park</Authors>
       <Copyright>Copyright © $(FullYear) — Cake Contributions</Copyright>
       <Description>Cake AddIn that extends Cake with ability to post Code Coverage results to Coveralls.io.</Description>
-      <PackageIcon>icon.png</PackageIcon>
-      <PackageIconUrl>https://cdn.jsdelivr.net/gh/cake-contrib/graphics/png/cake-contrib-medium.png</PackageIconUrl>
       <PackageLicenseExpression>MIT</PackageLicenseExpression>
       <PackageProjectUrl>https://github.com/cake-contrib/Cake.Coveralls/</PackageProjectUrl>
       <PackageTags>cake;script;build;coveralls;cake-addin</PackageTags>
@@ -28,14 +26,17 @@
   <PropertyGroup>
     <CodeAnalysisRuleSet>Cake.Coveralls.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
+  <ItemGroup>
+    <None Remove="icon.png" />
+  </ItemGroup>
 
   <ItemGroup>
     <PackageReference Include="Cake.Core" Version="1.0.0" PrivateAssets="All" />
     <PackageReference Include="Cake.Addin.Analyzer" Version="0.1.3">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="CakeContrib.Guidelines" Version="0.5.0">
+    <PackageReference Include="CakeContrib.Guidelines" Version="1.1.1">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>