release v0.5.4 (#285)

* replace bsd3 license by bsd4

* add attachments with save and send commands (#284)

* set up tpl save and send commands

* improve msg save and send handlers

* add vim msg#add_attachment fn

* improve vim logs

* update changelog

* add attachment keybind vim doc

* reverse range order fetch envelopes (#276)

* bump version v0.5.4

vim/ftplugin/himalaya-msg-write.vim

@@ -7,6 +7,10 @@ if exists("g:himalaya_complete_contact_cmd")
   setlocal completefunc=himalaya#msg#complete_contact
 endif
 
+call himalaya#shared#bindings#define([
+  \["n", "ga", "msg#add_attachment"],
+\])
+
 augroup himalaya_write
   autocmd! * <buffer>
   autocmd  BufWriteCmd <buffer> call himalaya#msg#draft_save()