tools: ignore node_trace.*.log

`node_trace.*.log` files are generated by `NodeTraceWriter`.

Refs: https://github.com/nodejs/node/pull/9304
PR-URL: https://github.com/nodejs/node/pull/12754
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

.gitignore

@@ -34,6 +34,7 @@ node_g
 .benchmark_reports
 icu_config.gypi
 .eslintcache
+node_trace.*.log
 
 /out