Attribute authenticated API requests to the user

Closes #134

Packages/Pachyderm/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "Pachyderm",
     platforms: [
-        .iOS(.v14),
+        .iOS(.v15),
     ],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.

Packages/Pachyderm/Sources/Pachyderm/Client.swift

@@ -122,6 +122,8 @@ public class Client {
         }
         if let accessToken = accessToken {
             urlRequest.setValue("Bearer \(accessToken)", forHTTPHeaderField: "Authorization")
+            // We consider authenticated requests to be user-initiated.
+            urlRequest.attribution = .user
         }
         return urlRequest
     }