Bump log4net in /examples/WireMock.Net.StandAlone.Net452 (#575)

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](apache/logging-log4net@rel/2.0.8...rel/2.0.10)

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examples/WireMock.Net.StandAlone.Net452/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="log4net" version="2.0.8" targetFramework="net452" />
+  <package id="log4net" version="2.0.10" targetFramework="net452" />
   <package id="Microsoft.AspNet.WebApi.Client" version="5.2.6" targetFramework="net452" />
   <package id="Microsoft.Owin.Host.HttpListener" version="4.0.0" targetFramework="net452" />
   <package id="Newtonsoft.Json" version="11.0.2" targetFramework="net452" />