Add link to blog post about RestoreLockedMode

Author: 0xced

src/Serilog.Formatting.Log4Net.csproj

@@ -44,6 +44,7 @@
     <DisableImplicitNuGetFallbackFolder>true</DisableImplicitNuGetFallbackFolder>
     <NuGetLockFilePath>../packages.lock.json</NuGetLockFilePath>
     <RestorePackagesWithLockFile>true</RestorePackagesWithLockFile>
+    <!-- https://devblogs.microsoft.com/nuget/enable-repeatable-package-restores-using-a-lock-file/#how-does-nuget-use-the-lock-file -->
     <RestoreLockedMode Condition="$(ContinuousIntegrationBuild) == 'true'">true</RestoreLockedMode>
   </PropertyGroup>