feat: update the coverage to exclude "normal" lines

This will now exclude lines that are not added or edited in the diff.
They are lines that are included in the diff context but will still
count towards the coverage percentage.

You now get a more accurate coverage percentage from what you have
edited in the diff.

src/report.ts

@@ -54,7 +54,14 @@ export const printReport = (diff: Diff[], coverage: any) => {
         if (change.type === "del") {
           continue;
         }
+
         const line = change.ln || change.ln2;
+
+        if (change.type === "normal") {
+          console.log(line.toString().padStart(4, " "), "\x1b[0m", change.content.substring(1), "\x1b[0m");
+          continue;
+        }
+
         let color = "\x1b[0m";
         if (typeof fileCoverage[line] !== "undefined") {
           color = fileCoverage[line] > 0 ? "\x1b[32m" : "\x1b[31m";