Update Readme.md figure with corrected error bars

Change-Id: I72fec2d7155d023cec48f9c74697397033b43a50
diff --git a/figures/hello-world.png b/figures/hello-world.png
index 6e2f27d..58579df 100644
--- a/figures/hello-world.png
+++ b/figures/hello-world.png
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