Remove warning from null assignement

Author: kzu

src/CredentialManager/CommandContext.cs

@@ -142,7 +142,7 @@ public IEnumerable<string> GetRegex(GitConfigurationLevel level, GitConfiguratio
 
             public bool TryGet(GitConfigurationLevel level, GitConfigurationType type, string name, out string value)
             {
-                value = GetAll(level, type, name).FirstOrDefault();
+                value = GetAll(level, type, name).FirstOrDefault()!;
                 return value is not null;
             }
 

src/CredentialManager/CredentialManager.csproj

@@ -4,6 +4,7 @@
     <TargetFramework>netstandard2.0</TargetFramework>
     <AssemblyName>Devlooped.CredentialManager</AssemblyName>
     <RootNamespace>GitCredentialManager</RootNamespace>
+    <Nullable>annotations</Nullable>
     <PackageId>Devlooped.CredentialManager</PackageId>
     <PackageTags>cross-platform xplat credentials manager</PackageTags>
     <PackageProjectUrl>https://clarius.org/CredentialManager</PackageProjectUrl>