add release notes for v4.2

diff --git a/RELEASE-NOTES-4.2 b/RELEASE-NOTES-4.2
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+ ┌──────────────────────────────┐
+ │ Release notes for i3 v4.2    │
+ └──────────────────────────────┘
+
+This is the second release of the new major version of i3, v4.2. It is
+considered stable. All users of i3 are strongly encouraged to upgrade.
+
+A big change with this release is (again) a new parser for commands. You might
+get the impression that we like rewriting parsers, but check the commit message
+of commit a532f5a for rationale on this decision.
+
+A more visible change to users is the introduction of a scratchpad command:
+This is useful to have a permanent editor session ready whenever you need it.
+Or your music player. Or email client? Or $programming-language REPL? Give it a
+try!
+
+Also, you are finally able to move workspaces between the different outputs if
+you are using multiple monitors. You can rename workspaces on the fly and
+identify named workspaces by their number. So you can rename "1: www" to "1:
+code" with one simple rename command and all your keybindings will still work.
+
+A subtle indicator of the split state of containers has been introduced: In
+case you are in a split container with precisely one window (a situation which
+you could not recognize by looking at your screen previously), i3 will
+highlight the bottom/right border of the split container in a lighter blue.
+This should reduce confusion about whether you are dealing with a split
+container or not.
+
+And finally, i3bar now supports a JSON input protocol, so that with a
+subsequent release of i3status, you will be able to use colors in your bar!
+
+ ┌────────────────────────────┐
+ │ Changes in v4.2            │
+ └────────────────────────────┘
+
+  • i3-sensible-*: don’t call which without parameters
+  • i3-config-wizard: Mark the currently selected modifier with an arrow
+  • i3bar: kick tray clients after output configuration changed
+  • i3bar: kill child processes when exit()ing (they might be stopped)
+  • i3bar now supports a JSON input format to provide colors and more (later)
+  • Support different modifier keys for showing i3bar in hide mode
+  • bar config: add i3bar_command for non-standard setups
+  • Implement scratchpad functionality
+  • Implement 'focus output left|right|up|down'
+  • Implement 'workspace next_on_output|prev_on_output'
+  • Implement 'move workspace to output <output>'
+  • Implement a new parser for commands
+  • Implement 'workspace number <number>' to switch to named workspaces
+  • Implement 'move [container|window] to workspace number <number>'
+  • Implement 'rename workspace <old_name> to <new_name>'
+  • Re-implement borders in the workspace bar
+  • Draw a separator line after each tab in tabbed mode
+  • Ignore aspect ratio during fullscreen mode (fixes MPlayer subtitles)
+  • Correctly restore focus after in-place restarts
+  • Highlight the right/bottom border of split windows ("indicator")
+  • Install /usr/share/applications/i3.desktop so that you can select i3 as a
+    window manager in GNOME
+  • Don’t migrate unfocused empty workspaces when disabling an output
+  • randr: Skip workspaces which are assigned to a different output when
+    creating a new workspace
+  • Implement an urgency flag criterion
+  • Render only once for all matching assignments
+  • Implement support for user configuration of constraints on floating window
+    dimensions
+  • Extend move command for floating windows
+  • Added option to select primary display on tray_output
+  • Implement resize <grow|shrink> <width|height>, use it in the default config
+  • Replace the old fullscreen container when requesting fullscreen
+  • Prevent changing focus outside a container when scrolling on the
+    decorations
+  • Only resize when the left/right mouse button is used, not when scrolling
+  • docs: replace the refcard with an HTML version
+  • cfgparse: accept force-xinerama as a synonym of force_xinerama
+  • Implement support for 32 bit visuals (necessary for transparency)
+  • X11: only copy the requested region from buffer pixmaps in ExposeEvents
+
+ ┌────────────────────────────┐
+ │ Bugfixes                   │
+ └────────────────────────────┘
+
+  • Bugfix: Don’t leak IPC file descriptors
+  • Bugfix: fix empty tray icon areas in i3bar
+  • Bugfix: properly handle workspace names with double quotes
+
+ ┌────────────────────────────┐
+ │ Thanks!                    │
+ └────────────────────────────┘
+
+Thanks for testing, bugfixes, discussions and everything I forgot go out to:
+
+  Aaron Small, ablepharus, aksr, alexander, badboy, B-con, beauby, ben, biiter,
+  binzter, cg, cradle, darkraven, dbp, dcoppa, Don, dothebart, D Thompson,
+  eeemsi, f8l, Fandekasp, fernandotcl, gamo, garga, gregkh, Han, helgikrs,
+  Jeremy O'Brien, jjfoerch, joepd, Jose Pereira, Jure Ziberna, MasterofJOKers,
+  Merovius, mhcerri, migueldvb, moemoe, mseed, mxf, nh2, noxxun, Paul, Pavel
+  Löbl, Peter Bui, Phlogistique, phnom, piroko, rami, SardemFF7, xeen, xpt,
+  zeus
+
+-- Michael Stapelberg, 2012-04-25