NuGet packages update.

TestCentre/UnitTests.fs

@@ -4,7 +4,6 @@
     open WetPancake
     open TestingConstants
     open System.IO
-    open System
     open InputGeneration
 
     module ``File Access Tests`` =

TestCentre/packages.config

@@ -6,7 +6,7 @@
   <package id="System.ValueTuple" version="4.5.0" targetFramework="net471" />
   <package id="xunit" version="2.3.1" targetFramework="net471" />
   <package id="xunit.abstractions" version="2.0.1" targetFramework="net471" />
-  <package id="xunit.analyzers" version="0.9.0" targetFramework="net471" />
+  <package id="xunit.analyzers" version="0.10.0" targetFramework="net471" />
   <package id="xunit.assert" version="2.3.1" targetFramework="net471" />
   <package id="xunit.core" version="2.3.1" targetFramework="net471" />
   <package id="xunit.extensibility.core" version="2.3.1" targetFramework="net471" />