Upgrade the PosInformatique.FluentAssertions.Json library.

Author: GillesTourreau

Directory.Packages.props

@@ -15,7 +15,7 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
     <PackageVersion Include="Moq" Version="4.20.72" />
     <PackageVersion Include="PosInformatique.Moq.Analyzers" Version="1.11.0" />
-    <PackageVersion Include="PosInformatique.FluentAssertions.Json" Version="1.4.0-rc.1" />
+    <PackageVersion Include="PosInformatique.FluentAssertions.Json" Version="1.4.0" />
     <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.556" />
     <PackageVersion Include="xunit" Version="2.8.1" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.1" />