Fix test

tests/predict_test.py

@@ -29,5 +29,5 @@ def test_on_target_predict_size_guide():
     for pam in pams:
         (pam_val, start_val) = pam
         assert (
-            start_val - pam_val == 2
+            start_val - pam_val == 3
         ), "the difference between start and pam position is different than 2"