perf: Forgot newline

Author: peaBerberian

tests/performance/run.mjs

@@ -347,9 +347,10 @@ function formatResultInHumanReadableWay(results) {
       "-".repeat(meanColumnInnerLength) +
       "|" +
       "-".repeat(medianColumnInnerLength) +
-      "|\n";
+      "|";
   }
   for (let i = 0; i < results.length; i++) {
+    str += "\n";
     const nameWhitespaceLength = (nameColumnInnerLength - testNames[i].length) / 2;
     const meanWhitespaceLength = (meanColumnInnerLength - meanResult[i].length) / 2;
     const medianWhitespaceLength = (medianColumnInnerLength - medianResult[i].length) / 2;