peco_select_history can take initial query

plugins/peco/README → plugins/peco/README.md

+peco
+----
+
 Based directly on the percol plugin.
 
-Please bind peco_select_history in your favorite key.
+Please bind peco_select_history to your favorite key.
 
 If you'd like to bind CTRL+R
-
+```
 function fish_user_key_bindings
-  bind \cr peco_select_history
+  bind \cr 'peco_select_history (commandline -b)'
 end
+```

plugins/peco/peco_select_history.fish

 function peco_select_history
-  history|peco|read foo
+  if test (count $argv) = 0
+    set peco_flags --layout=bottom-up
+  else
+    set peco_flags --layout=bottom-up --query "$argv"
+  end
+
+  history|peco $peco_flags|read foo
+
   if [ $foo ]
     commandline $foo
   else