.NET Core 3.0 Update

Updated Travis Build to use 3.0.100
PackageIcons and Repository URLS

Author: DemoXinMC

.travis.yml

@@ -1,7 +1,7 @@
 language: csharp
 mono: none
 dist: xenial
-dotnet: 2.2.104
+dotnet: 3.0.100
 script:
  - dotnet restore
  - dotnet build

SFML.NuGet.props

@@ -12,13 +12,16 @@
 
     <PackageLicenseExpression>Zlib</PackageLicenseExpression>
     <PackageProjectUrl>https://www.sfml-dev.org/</PackageProjectUrl>
-    <PackageIconUrl>https://www.sfml-dev.org/images/sfml-icon.png</PackageIconUrl>
+    <RepositoryUrl>https://github.com/SFML/SFML.Net</RepositoryUrl>
+    <PackageIcon>sfml-icon.png</PackageIcon>
 
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta2-18618-05" PrivateAssets="all" />
+	
+    <None Include="..\..\sfml-icon.png" Pack="true" PackagePath=""/>
   </ItemGroup>
 
 </Project>

sfml-icon.png

@@ -12,10 +12,11 @@
     </Description>
     <Title>SFML.Net</Title>
     <IncludeBuildOutput>false</IncludeBuildOutput>
+    <NoWarn>$(NoWarn);NU5128</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\SFML.Audio\SFML.Audio.csproj"  />
+    <ProjectReference Include="..\SFML.Audio\SFML.Audio.csproj" />
     <ProjectReference Include="..\SFML.Graphics\SFML.Graphics.csproj" />
     <ProjectReference Include="..\SFML.System\SFML.System.csproj" />
     <ProjectReference Include="..\SFML.Window\SFML.Window.csproj" />