add a release checklist so I won't forget steps in the future

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+Notes to myself on all the steps to make for a Ninja release.
+
+1. git checkout release; git merge master
+2. fix version number in source (it will likely conflict in the above)
+3. fix version in doc/manual.asciidoc
+4. rebuild manual, put in place on website
+5. commit, tag, push
+6. construct release notes from prior notes
+   credits: git shortlog -s --no-merges REV..