Rename RELEASE_NOTES.md to RELEASE_NOTES.txt

It is not a markdown formatted file.
pulse-vadc · Aug 16, 2018 · c4f0a4a · c4f0a4a
1 parent 4fe78de
commit c4f0a4a
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diff --git a/RELEASE_NOTES.md → RELEASE_NOTES.txt b/RELEASE_NOTES.md → RELEASE_NOTES.txt