NRE with v2.1.0

[gregsdennis]

Running with any of the new configuration points in the config file. Getting NRE:

Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
   at Pushpay.SemVerAnalyzer.AppSettings.GetOverrideType(Type ruleType) in /home/runner/work/semantic-versioning-analyzer/semantic-versioning-analyzer/source/SemVerAnalyzer/AppSettings.cs:line 16
   at Pushpay.SemVerAnalyzer.AppModule.<Load>b__2_1(Type t) in /home/runner/work/semantic-versioning-analyzer/semantic-versioning-analyzer/source/SemVerAnalyzer/AppModule.cs:line 25
   at Autofac.Features.Scanning.ScanningRegistrationExtensions.<>c__DisplayClass3_2.<ScanTypes>b__3(Func`2 p)
   at System.Linq.Enumerable.All[TSource](IEnumerable`1 source, Func`2 predicate)
   at Autofac.Features.Scanning.ScanningRegistrationExtensions.<>c__DisplayClass3_0.<ScanTypes>b__2(Type t)
   at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
   at Autofac.Features.Scanning.ScanningRegistrationExtensions.ScanTypes(IEnumerable`1 types, IComponentRegistryBuilder cr, IRegistrationBuilder`3 rb)
   at Autofac.Features.Scanning.ScanningRegistrationExtensions.ScanAssemblies(IEnumerable`1 assemblies, IComponentRegistryBuilder cr, IRegistrationBuilder`3 rb)
   at Autofac.Features.Scanning.ScanningRegistrationExtensions.<>c__DisplayClass0_0.<RegisterAssemblyTypes>b__0(IComponentRegistryBuilder cr)
   at Autofac.ContainerBuilder.Build(IComponentRegistryBuilder componentRegistry, Boolean excludeDefaultModules)
   at Autofac.ContainerBuilder.UpdateRegistry(IComponentRegistryBuilder componentRegistry)
   at Autofac.Module.Configure(IComponentRegistryBuilder componentRegistry)
   at Autofac.ContainerBuilder.Build(IComponentRegistryBuilder componentRegistry, Boolean excludeDefaultModules)
   at Autofac.ContainerBuilder.Build(ContainerBuildOptions options)
   at Pushpay.SemVerAnalyzer.Program.ConfigureServices(IConfiguration config, CompareCommand command) in /home/runner/work/semantic-versioning-analyzer/semantic-versioning-analyzer/source/SemVerAnalyzer/Program.cs:line 70
   at Pushpay.SemVerAnalyzer.Program.Compare(CompareCommand command) in /home/runner/work/semantic-versioning-analyzer/semantic-versioning-analyzer/source/SemVerAnalyzer/Program.cs:line 26
   at CommandLine.ParserResultExtensions.WithParsedAsync[T](ParserResult`1 result, Func`2 action)
   at Pushpay.SemVerAnalyzer.Program.Main(String[] args) in /home/runner/work/semantic-versioning-analyzer/semantic-versioning-analyzer/source/SemVerAnalyzer/Program.cs:line 20
   at Pushpay.SemVerAnalyzer.Program.<Main>(String[] args)

Might be a bigger issue with reading from the config file. All of the command line options work.

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Also, it doesn't seem that --assume-changes is doing the thing. See json-everything/json-everything#83 (comment)