Add release notes for 3.ε-bf1

RELEASE-NOTES-3.e-bf1

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+Release notes for i3 v3.ε-bf1
+-----------------------------
+
+This is the first bugfix release (bf1) for version 3.ε of i3. Current
+development focuses on the tree branch which contains a major refactoring.
+Because (as usual) there are still bugs in the stable versions, though, we
+felt it was a good idea to have this bugfix release.
+
+This release contains only bugfixes and is considered stable.
+
+All users of i3 3.ε are encouraged to upgrade as soon as possible.
+
+A list of changes follows:
+
+  * Bugfix: Correctly initialize workspaces if RandR is not available
+  * Bugfix: Correctly handle asprintf() return value
+  * Bugfix: Update _NET_WM_STATE when clients request changes via ClientMessage
+  * Bugfix: Don’t invert directions when resizing floating clients (top/left)
+  * Bugfix: Don’t leak file descriptors
+
+-- Michael Stapelberg, 2010-06-09