Move </tr> to right place.

gitstats

 		f.write(html_header(2, 'Commits by Timezone'))
 		f.write('<table><tr>')
 		f.write('<th>Timezone</th><th>Commits</th>')
+		f.write('</tr>')
 		max_commits_on_tz = max(data.commits_by_timezone.values())
 		for i in sorted(data.commits_by_timezone.keys(), key = lambda n : int(n)):
 			commits = data.commits_by_timezone[i]
 			r = 127 + int((float(commits) / max_commits_on_tz) * 128)
 			f.write('<tr><th>%s</th><td style="background-color: rgb(%d, 0, 0)">%d</td></tr>' % (i, r, commits))
-		f.write('</tr></table>')
+		f.write('</table>')
 
 		f.write('</body></html>')
 		f.close()