clamp start position for #43

Author: donaldcampbelljr

gtars/src/uniwig/mod.rs

@@ -653,7 +653,10 @@ pub fn uniwig_main(
                                                     &core_results.0,
                                                     file_name.clone(),
                                                     chrom_name.clone(),
-                                                    primary_start.0,
+                                                    clamped_start_position(
+                                                        primary_start.0,
+                                                        0,
+                                                    ),
                                                     stepsize,
                                                 );
                                             }