perf tools: Ignore 'perf timechart' output file

The default output file produced by the 'perf timechart' tool is called
output.svg, add it to .gitignore.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/1380789636-4512-1-git-send-email-artagnon@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/.gitignore b/tools/perf/.gitignore
index 8f8fbc2..782d86e 100644
--- a/tools/perf/.gitignore
+++ b/tools/perf/.gitignore
@@ -13,6 +13,7 @@
 common-cmds.h
 perf.data
 perf.data.old
+output.svg
 perf-archive
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