RELEASE_NOTES based on 2.7

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
diff --git a/RELEASE_NOTES b/RELEASE_NOTES
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+
+              ┌────────────────────────────────────────┐
+              │ RELEASE NOTES for FFmpeg 2.8 "Feynman" │
+              └────────────────────────────────────────┘
+
+   The FFmpeg Project proudly presents FFmpeg 2.8 "Feynman", about 3
+   months after the release of FFmpeg 2.7.
+
+   A complete Changelog is available at the root of the project, and the
+   complete Git history on http://source.ffmpeg.org.
+
+   We hope you will like this release as much as we enjoyed working on it, and
+   as usual, if you have any questions about it, or any FFmpeg related topic,
+   feel free to join us on the #ffmpeg IRC channel (on irc.freenode.net) or ask
+   on the mailing-lists.