Updated the logo to include the 'TM'-symbol

git-svn-id: https://svn.apache.org/repos/asf/ant/ivy/core/branches/2.1.0@1097623 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/doc/images/logo.png b/doc/images/logo.png
index 4baf170..5c01f3d 100644
--- a/doc/images/logo.png
+++ b/doc/images/logo.png
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