Bump log4net in /examples/WireMock.Net.StandAlone.NETCoreApp (#570)

Bumps [log4net](https://github.com/apache/logging-log4net) from 2.0.8 to 2.0.10.
- [Release notes](https://github.com/apache/logging-log4net/releases)
- [Changelog](https://github.com/apache/logging-log4net/blob/master/ReleaseInstructions.txt)
- [Commits](https://github.com/apache/logging-log4net/compare/rel/2.0.8...rel/2.0.10)

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examples/WireMock.Net.StandAlone.NETCoreApp/WireMock.Net.StandAlone.NETCoreApp.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="log4net" Version="2.0.8" />
+    <PackageReference Include="log4net" Version="2.0.10" />
   </ItemGroup>
 
   <ItemGroup>