patch 8.1.1068: cannot get all the information about current completion

Problem:    Cannot get all the information about current completion.
Solution:   Add complete_info(). (Shougo, Hirohito Higashi, closes #4106)
diff --git a/src/proto/edit.pro b/src/proto/edit.pro
index 3a1573f..3f82bff 100644
--- a/src/proto/edit.pro
+++ b/src/proto/edit.pro
@@ -18,6 +18,7 @@
 char_u *find_word_start(char_u *ptr);
 char_u *find_word_end(char_u *ptr);
 int ins_compl_active(void);
+void get_complete_info(list_T *what_list, dict_T *retdict);
 int ins_compl_add_tv(typval_T *tv, int dir);
 void ins_compl_check_keys(int frequency, int in_compl_func);
 int get_literal(void);