Change "put selection" key binding to Y

Previously this was `Ctrl-y` but that overrode the default vi-copy mode
key binding.

Closes #27

CHANGELOG.md

@@ -1,6 +1,8 @@
 # Changelog
 
 ### master
+- change copy mode "put selection" key binding to `Y` so that vi mode `Ctrl-y`
+  is not overriden.
 
 ### v1.0.0, Dec 06, 2014
 - simplify README

README.md

@@ -6,6 +6,9 @@ Enables copying to system clipboard in Tmux. Works on Linux and OS X.
 
 [![screencast screenshot](/video/screencast_img.png)](https://vimeo.com/102039099)
 
+Note: screencast shows using the "put selection" feature with `Ctrl-y` key
+binding in copy mode. In `v2.0.0` this key binding was changed to `Y` (shift-y).
+
 ### Key bindings
 
 - `prefix + y` - copies text from the command line to clipboard.<br/>
@@ -19,7 +22,8 @@ Enables copying to system clipboard in Tmux. Works on Linux and OS X.
 
 **copy mode** bindings:
 - `y` - copy selection to system clipboard
-- `Ctrl-y` - "put" selection - equivalent to copying a selection, and pasting it to the command line
+- `Y` (shift-y) - "put" selection - equivalent to copying a selection, and
+  pasting it to the command line
 - `Alt-y` - performs both of the above: copy to system clipboard and
   put to command line
 

scripts/key_binding_helpers.sh

@@ -4,7 +4,7 @@ yank_line_option="@yank_line"
 yank_default="y"
 yank_option="@copy_mode_yank"
 
-put_default="C-y"
+put_default="Y"
 put_option="@copy_mode_put"
 
 yank_put_default="M-y"