tools: make the commit message more informative, for the repo for htt…

…ps://fast.vlang.io/ in cmd/tools/fast/website/

cmd/tools/fast/fast.v

@@ -163,7 +163,7 @@ fn main() {
 		os.chdir('website')!
 		lexec('git checkout gh-pages')
 		os.mv('../index.html', 'index.html')!
-		lsystem('git commit -am "update benchmark"')
+		lsystem('git commit -am "update benchmark for commit ${commit}"')
 		lsystem('git push origin gh-pages')
 		elog('uploading done')
 	}