add an option to show type info when completion is done

Author: haya14busa

doc/vim-go.txt

@@ -1440,6 +1440,13 @@ the `hello_world.go` file is used.
     The default is: >
 
       let g:go_decls_includes = 'func,type'
+<
+                                                       *'g:go_echo_go_info'*
+
+Use this option to show the identifier information when completion is done. By
+default it's enabled >
+
+      let g:go_echo_go_info = 1
 <
 ==============================================================================
 TROUBLESHOOTING                                         *go-troubleshooting*

plugin/go.vim

@@ -126,6 +126,10 @@ endfunction
 " ============================================================================
 "
 function! s:echo_go_info()
+  if get(g:, "go_echo_go_info", 0)
+    return
+  endif
+
   if !exists('v:completed_item') || empty(v:completed_item)
     return
   endif