Ignore the generated markdown files.

retronym · retronym · commit bcea1cf73c35 · 2013-09-27T12:20:35.000+02:00
We don't commit this back to the repo, as we do for
the HTML.
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,2 @@
+release-notes*.md
+target
