Update README.md

Edd Wilder-James · web-flow · commit 9c989e78108e · 2019-03-12T16:10:51.000-07:00
diff --git a/sigs/logos/README.md b/sigs/logos/README.md
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 These are the official logos for TensorFlow SIGs. If you need a new logo making, please file an issue and assign to @ewilderj.
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+Each logo has a PNG version with a transparent background, and a JPEG with a white background.
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 These are the official logos for TensorFlow SIGs. If you need a new logo making, please file an issue and assign to @ewilderj.
++
 +Each logo has a PNG version with a transparent background, and a JPEG with a white background.
++