meta: add package logo to distributions

this resolves #1006.

Discord.Net.targets

@@ -6,6 +6,7 @@
         <PackageTags>discord;discordapp</PackageTags>
         <PackageProjectUrl>https://github.com/RogueException/Discord.Net</PackageProjectUrl>
         <PackageLicenseUrl>http://opensource.org/licenses/MIT</PackageLicenseUrl>
+        <PackageIconUrl>https://github.com/RogueException/Discord.Net/raw/dev/docs/marketing/logo/PackageLogo.png</PackageIconUrl>
         <RepositoryType>git</RepositoryType>
         <RepositoryUrl>git://github.com/RogueException/Discord.Net</RepositoryUrl>
     </PropertyGroup>
@@ -22,4 +23,4 @@
         <WarningsAsErrors>true</WarningsAsErrors>
         <GenerateDocumentationFile>true</GenerateDocumentationFile>
     </PropertyGroup>
-</Project>
+</Project>

src/Discord.Net/Discord.Net.nuspec

@@ -11,6 +11,7 @@
     <projectUrl>https://github.com/RogueException/Discord.Net</projectUrl>
     <licenseUrl>http://opensource.org/licenses/MIT</licenseUrl>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <iconUrl>https://github.com/RogueException/Discord.Net/raw/dev/docs/marketing/logo/PackageLogo.png</iconUrl>
     <dependencies>
         <group targetFramework="net45">
             <dependency id="Discord.Net.Core" version="2.0.0-beta2$suffix$" />