minor fixes to build and pass tests

cmd/stress/main.go

···
 		rand.Read(buf)
 		id := hex.EncodeToString(buf)
 
-		acc, err := atp.CreateAccount(ctx, fmt.Sprintf("[e-mail]", id), "user-"+id+".test", "password")
+		var invite *string
+		acc, err := atp.CreateAccount(ctx, fmt.Sprintf("[e-mail]", id), "user-"+id+".test", "password", invite)
 		if err != nil {
 			return err
 		}
···
 		quiet := cctx.Bool("quiet")
 
 		atp.C.Auth = &xrpc.AuthInfo{
-			Did:      acc.Did,
-			Jwt:      acc.AccessJwt,
-			Username: acc.Handle,
+			Did:       acc.Did,
+			AccessJwt: acc.AccessJwt,
+			Handle:    acc.Handle,
 		}
 
 		count := cctx.Int("count")

mst/mst_test.go

···
 			}
 		}
 	} else {
-		t.Fatal("different number of values than expected: %d != %d", len(vals), len(out))
+		t.Fatalf("different number of values than expected: %d != %d", len(vals), len(out))
 	}
 }